| Scientific Name | English Common Name |
| Abronia umbellata var. breviflora | pink sand-verbena |
| Acer ginnala | Amur maple |
| Acer rubrum var. rubrum | red maple |
| Achnatherum lemmonii ssp. lemmonii | Lemmon's needlegrass |
| Achnatherum nelsonii ssp. dorei | Columbia needlegrass |
| Achnatherum nelsonii ssp. nelsonii | Nelson's needlegrass |
| Achnatherum occidentale ssp. pubescens | stiff needlegrass |
| Aconitum columbianum ssp. columbianum | Columbian monkshood |
| Actaea elata var. elata | tall bugbane |
| Adiantum aleuticum var. aleuticum | western maiden-hair fern |
| Adiantum aleuticum var. subpumilum | dwarf maiden-hair fern |
| Adiantum raddianum | delta maidenhair |
| Aegilops cylindrica | jointed goatgrass |
| Aegilops tauschii | goat grass |
| Agoseris aurantiaca ssp. aurantiaca | orange agoseris |
| Agoseris aurantiaca var. aurantiaca | orange agoseris |
| Agoseris grandiflora var. leptophylla | large-flowered agoseris |
| Agoseris heterophylla var. heterophylla | annual agoseris |
| Agropyron cristatum ssp. pectinatum | crested wheatgrass |
| Agrostis canina | velvet bentgrass |
| Agrostis castellana | highland bentgrass |
| Agrostis idahoensis | Idaho bentgrass |
| Agrostis oregonensis | Oregon bentgrass |
| Agrostis variabilis | mountain bentgrass |
| Alchemilla monticola | hairy lady's mantle |
| Alisma lanceolatum | lance-leaved water-plantain |
| Alisma plantago-aquatica | European water-plantain |
| Allium cepa | garden onion |
| Allium cernuum var. cernuum | nodding onion |
| Allium geyeri var. tenerum | Geyer's onion |
| Allium x proliferum | walking onion |
| Alnus alnobetula ssp. crispa | green alder |
| Alnus alnobetula ssp. fruticosa | Siberian alder |
| Alnus incana ssp. tenuifolia | mountain alder |
| Alopecurus aequalis var. aequalis | little meadow-foxtail |
| Alopecurus myosuroides | slender meadow foxtail |
| Amaranthus blitum | purple amaranth |
| Amaranthus blitum ssp. emarginatus | purple amaranth |
| Amaranthus hypochondriacus | prince's-feather amaranth |
| Amaranthus powellii ssp. powellii | Powell's amaranth |
| Amaranthus rudis | water hemp |
| Amberboa moschata | sweet sultan |
| Ambrosia psilostachya | western ragweed |
| Amelanchier alnifolia var. alnifolia | prairie saskatoon |
| Ammophila arenaria ssp. arenaria | European beachgrass |
| Amsinckia intermedia | common fiddleneck |
| Amsinckia tesselata | bristly fiddleneck |
| Anarrhinum bellidifolium | daisy-leaved toadflax |
| Anchusa azurea var. azurea | Italian bugloss |
| Andromeda polifolia var. polifolia | bog-rosemary |
| Androsace chamaejasme ssp. andersonii | sweet-flowered fairy-candelabra |
| Androsace chamaejasme ssp. lehmanniana | sweet-flowered fairy-candelabra |
| Anemonastrum sibiricum | narcissus anemone |
| Anemonastrum villosissimum | narcissus-flowered anemone |
| Anemone narcissiflora var. villosissima | narcissus-flowered anemone |
| Anemone virginiana var. cylindroidea | riverbank anemone |
| Antennaria howellii ssp. neodioica | northern pussytoes |
| Antennaria howellii ssp. petaloidea | petaloid pussytoes |
| Antennaria luzuloides ssp. luzuloides | woodrush pussytoes |
| Antennaria monocephala ssp. angustata | narrow-leaved pygmy pussytoes |
| Antennaria monocephala ssp. monocephala | pygmy pussytoes |
| Antennaria monocephela ssp. angustata | narrow-leaved pygmy pussytoes |
| Antennaria pallida | pale pussytoes |
| Antennaria pulcherrima | showy pussytoes |
| Antennaria pulvinata | pulvinate pussytoes |
| Antennaria rosea ssp. arida | desert pussytoes |
| Antennaria rosea ssp. confinis | brown-edged pussytoes |
| Antennaria rosea ssp. rosea | rosy pussytoes |
| Anthoxanthum monticola | alpine sweetgrass |
| Aphanes occidentalis | western parsley-piert |
| Aphyllon ludovicianum | Louisiana broomrape |
| Aphyllon purpureum | western one-flowered broomrape |
| Apocynum androsaemifolium var. pumilum | spreading dogbane |
| Aquilegia formosa var. formosa | Sitka columbine |
| Arabis caucasica | rock cress |
| Aralia elata | Japanese angelica tree |
| Arceuthobium douglasii | Douglas' dwarf mistletoe |
| Arctagrostis latifolia ssp. arundinacea | polargrass |
| Arctanthemum arcticum | Arctic daisy |
| Arctanthemum arcticum ssp. arcticum | Arctic daisy |
| Arenaria serpyllifolia var. serpyllifolia | thyme-leaved sandwort |
| Argemone mexicana | Mexican poppy |
| Aristida oligantha | prairie threeawn |
| Aristida purpurea | red three-awn |
| Aristida purpurea var. longiseta | red three-awn |
| Arrhenatherum elatius ssp. bulbosum | bulbous tall oatgrass |
| Arrhenatherum elatius ssp. elatius | tall oatgrass |
| Arrhenatherum elatius var. bulbosum | bulbous tall oatgrass |
| Arrhenatherum elatius var. elatius | tall oatgrass |
| Artemisia annua | sweet sagewort |
| Artemisia borealis | boreal wormwood |
| Artemisia furcata | three-forked mugwort |
| Artemisia herriotii | white sagebrush |
| Artemisia norvegica ssp. saxatilis | mountain sagewort |
| Artemisia scoparia | redstem wormwood |
| Artemisia stelleriana | beach wormwood |
| Artemisia tripartita | threetip sagebrush |
| Arum italicum | Italian arum |
| Asclepias ovalifolia | oval-leaf milkweed |
| Asperula arvensis | blue woodruff |
| Asplenium trichomanes ssp. quadrivalens | limestone maidenhair spleenwort |
| Aster alpinus ssp. vierhapperi | alpine aster |
| Astilbe chinensis | astilbe |
| Astragalus canadensis var. brevidens | Canadian milk-vetch |
| Astragalus canadensis var. canadensis | Canadian milk-vetch |
| Astragalus crassicarpus var. paysonii | ground plum milk-vetch |
| Astragalus flexuosus | flexile milk-vetch |
| Astragalus laxmannii var. tananaicus | Laxmann's milk-vetch |
| Astragalus lentiginosus var. lentiginosus | freckled milk-vetch |
| Astragalus miser var. miser | timber milk-vetch |
| Astragalus missouriensis var. missouriensis | Missouri milk-vetch |
| Astragalus trichopodus var. lonchus | Santa Barbara milkvetch |
| Astragalus vexilliflexus var. vexilliflexus | bent-flowered milk-vetch |
| Athyrium alpestre var. americanum | alpine lady fern |
| Athyrium filix-femina var. cyclosorum | lady fern |
| Atriplex argentea ssp. argentea | silvery orache |
| Atriplex argentea var. argentea | silvery orache |
| Atriplex rosea | red orache |
| Avena barbata | slender wild oat |
| Bassia hyssopifolia | five-hooked bassia |
| Berberis darwinii | Darwin's berberis |
| Betula nana ssp. exilis | Scrub Birch |
| Betula papyrifera var. commutata | paper birch |
| Betula pubescens | downy birch |
| Betula pubescens ssp. pubescens | downy birch |
| Bidens beckii | water marigold |
| Bidens connata | purplestem beggarticks |
| Bidens pilosa | hairy beggarticks |
| Blitum hastatum | Over's goosefoot |
| Boechera cascadensis | littleleaf rockcress |
| Boechera divaricarpa | uplifting suncress |
| Boechera drepanoloba | pointing suncress |
| Boechera paupercula | tiny suncress |
| Boechera polyantha | silver suncrest |
| Boechera sparsiflora | stretching suncress |
| Bolboschoenus fluviatilis | river bulrush |
| Bolboschoenus glaucus | bulbous bulrush |
| Botrychium campestre var. lineare | Linear-leaf moonwort |
| Botrychium michiganense | Michigan moonwort |
| Botrychium neolunaria | North American moonwort |
| Botrychium pallidum | pale moonwort |
| Botrychium simplex var. compositum | least moonwort |
| Botrychium yaaxudakeit | Yakutat moonwort |
| Brachypodium sylvaticum ssp. sylvaticum | slender false brome |
| Brassica juncea | Indian mustard |
| Brassica napus | turnip |
| Brassica nigra | black mustard |
| Brassica oleracea var. oleracea | cabbage |
| Braya humilis ssp. maccallae | McCalla's dwarf braya |
| Brickellia oblongifolia var. oblongifolia | narrow-leaved brickellia |
| Briza minor | small quaking grass |
| Brodiaea coronaria ssp. coronaria | harvest brodiaea |
| Brodiaea rosea spp. rosea | harvest Brodiaea |
| Brodiaea rosea ssp. rosea | harvest rosea |
| Bromus aleutensis | Aleutian brome |
| Bromus arvensis | field brome |
| Bromus carinatus var. marginatus | mountain brome |
| Bromus commutatus | meadow brome |
| Bromus erectus | erect brome |
| Bromus hordeaceus ssp. hordeaceus | soft brome |
| Bromus lanceolatus | Mediterranean brome |
| Bromus porteri | Porter's brome |
| Bromus rubens | red brome |
| Bromus squarrosus var. squarrosus | squarrose brome |
| Buglossoides arvensis | corn gromwell |
| Bupleurum rotundifolia | hare's ear |
| Cakile maritima ssp. maritima | European searocket |
| Calamagrostis canadensis var. canadensis | bluejoint reedgrass |
| Calamagrostis canadensis var. langsdorfii | bluejoint reedgrass |
| Calamagrostis stricta ssp. stricta | slimstem reedgrass |
| Callitriche brutia var. hamulata | narrowleaf water-starwort |
| Callitriche heterophylla | Large Water-starwort |
| Callitriche heterophylla var. bolanderi | diverse-leaved water-starwort |
| Callitriche heterophylla var. heterophylla | two-edged water-starwort |
| Callitriche stenoptera | narrow-winged water-starwort |
| Callitriche terrestris | terrestrial water-starwort |
| Calystegia macounii | Macoun's false bindweed |
| Calystegia pubescens | TBD |
| Calystegia sepium ssp. erratica | erratic false bindweed |
| Calystegia silvatica | shortstalk false bindweed |
| Calystegia silvatica ssp. silvatica | shortstalk false bindweed |
| Camissonia bistorta | southern suncup |
| Camissonia micrantha | miniature suncup |
| Campanula porscharskyana | TBD |
| Cardamine breweri | Brewer's bitter-cress |
| Cardamine breweri var. breweri | Brewer's bitter-cress |
| Cardamine breweri var. orbicularis | Brewer's bitter-cress |
| Cardamine cordifolia var. lyallii | heart-leaved bitter-cress |
| Cardamine corymbosa | New Zealand bittercress |
| Cardamine parviflora | Small-flowered Bittercress |
| Cardamine parviflora var. arenicola | small-flowered bitter-cress |
| Cardaria draba ssp. draba | heart-podded hoary-cress |
| Carduus nutans ssp. leiophyllus | nodding thistle |
| Carex aquatilis ssp. stans | water sedge |
| Carex aquatilis var. substricta | calcareous water sedge |
| Carex arctiformis | polar sedge |
| Carex arctogena | black sedge |
| Carex brunnescens ssp. brunnescens | brownish sedge |
| Carex deflexa var. boottii | northern sedge |
| Carex deflexa var. deflexa | northern sedge |
| Carex deweyana var. deweyana | Dewey's sedge |
| Carex eleusinoides | goosegrass sedge |
| Carex enanderi | Enander's sedge |
| Carex epapillosa | blackened sedge |
| Carex filifolia var. filifolia | thread-leaved sedge |
| Carex flacca | heath sedge |
| Carex foenea | bronze sedge |
| Carex fuliginosa ssp. misandra | short-leaved sedge |
| Carex garberi ssp. bifaria | Garber's sedge |
| Carex garberi ssp. garberi | Garber's sedge |
| Carex glacialis | glacier sedge |
| Carex glareosa ssp. glareosa | lesser saltmarsh sedge |
| Carex gmelinii | Gmelin's sedge |
| Carex granularis | limestone meadow sedge |
| Carex hassei | salt sedge |
| Carex heleonastes | Hudson Bay sedge |
| Carex hindsii | Hind's sedge |
| Carex infirminervia | weak-nerved sedge |
| Carex inops ssp. heliophila | long-stoloned sedge |
| Carex krausei | Krause's sedge |
| Carex lachenalii | two-parted sedge |
| Carex lacustris | lake sedge |
| Carex lapponica | Lapland sedge |
| Carex leptalea ssp. pacifica | bristle-stalked sedge |
| Carex livida var. radicaulis | pale sedge |
| Carex longii | green and white sedge |
| Carex lyngbyei ssp. cryptocarpa | Lyngbye's sedge |
| Carex mackenziei | Mackenzie's sedge |
| Carex macrochaeta | large-awned sedge |
| Carex maritima | curved sedge |
| Carex microchaeta ssp. microchaeta | small-awned sedge |
| Carex microglochin ssp. microglochin | few-seeded fen sedge |
| Carex pansa | sand-dune sedge |
| Carex paysonis | Payson's sedge |
| Carex pedunculata | peduncled sedge |
| Carex petricosa var. petricosa | rock-dwelling sedge |
| Carex praeceptorum | teacher's sedge |
| Carex praticola | meadow sedge |
| Carex saxatilis ssp. laxa | russet sedge |
| Carex scirpoidea ssp. stenochlaena | single-spike sedge |
| Carex scoparia | pointed broom sedge |
| Carex simulata | short-beaked fen sedge |
| Carex subbracteata | small-bracted sedge |
| Carex tahoensis | Tahoe sedge |
| Carex testacea | TBD |
| Carex tribuloides | blunt broom sedge |
| Carex tribuloides var. tribuloides | blunt broom sedge |
| Carex zikae | Zika's sedge |
| Carthamus creticus | distaff thistle |
| Carthamus tinctorius | safflower |
| Cassiope lycopodioides ssp. cristapilosa | clubmoss mountain-heather |
| Cassiope lycopodioides ssp. lycopodioides | clubmoss mountain-heather |
| Castilleja ambigua | Paintbrush |
| Castilleja pallida var. caudata | pale greenish paintbrush |
| Castilleja parviflora var. albida | white small-flowered paintbrush |
| Castilleja parviflora var. parviflora | small-flowered paintbrush |
| Castilleja purpurascens | Yoho paintbrush |
| Catabrosa aquatica | Water Whorl Grass |
| Catabrosa aquatica var. aquatica | water whorlgrass |
| Caylusea abyssinica | Caylusea |
| Ceanothus velutinus var. hookeri | snowbrush |
| Celastrus scandens | American bittersweet |
| Centaurea calcitrapa | red starthistle |
| Centaurea macrocephala | giant knapweed |
| Cerastium arvense ssp. arvense | field chickweed |
| Cerastium arvense ssp. strictum | matted field chickweed |
| Cerastium beeringianum ssp. beeringianum | Bering chickweed |
| Cerastium beeringianum ssp. earlei | Bering chickweed |
| Cerastium beeringianum var. beeringianum | Bering chickweed |
| Cerastium fischerianum | Fischer's chickweed |
| Cerastium fontanum ssp. vulgare | mouse-ear chickweed |
| Cerastium nutans var. nutans | nodding chickweed |
| Cerastium pumilum ssp. glutinosum | dwarf mouse-ear |
| Chaenactis douglasii var. douglasii | hoary false yarrow |
| Chaenorhinum minus ssp. minus | common dwarf snapdragon |
| Chamaesyce nutans | eyebane |
| Chamaesyce serpens | matted sandmat |
| Chamaesyce vermiculata | wormseed sandmat |
| Chenopodiastrum murale | nettle-leaved goosefoot |
| Chenopodium album ssp. striatum | lamb's-quarters |
| Chenopodium ambrosioides | Mexican tea |
| Chenopodium berlandieri var. zschackei | pitseed goosefoot |
| Chenopodium hians | gaping goosefoot |
| Chenopodium hybridum | TBD |
| Chenopodium incognitum | obscure goosefoot |
| Chenopodium opulifolium | seaport goosefoot |
| Chenopodium pratericola | desert goosefoot |
| Chenopodium probstii | TBD |
| Chenopodium strictum | late-flowering goosefoot |
| Chenopodium suecicum | Swedish goosefoot |
| Cherleria arctica | Arctic sandwort |
| Chimaphila umbellata ssp. umbellata | common pipsissewa |
| Chionodoxa forbesii | TBD |
| Chionodoxa luciliae | glory-of-the-snow |
| Cicuta maculata | spotted cowbane |
| Cicuta maculata var. angustifolia | spotted cowbane |
| Circaea alpina ssp. alpina | enchanter's-nightshade |
| Cirsium edule | edible thistle |
| Cirsium scariosum | elk thistle |
| Cirsium x vancouverense | Vancouver thistle |
| Cistus creticus | pink rock-rose |
| Cladanthus mixtus | TBD |
| Clarkia arcuata | glandular clarkia |
| Claytonia perfoliata ssp. intermontana | miner's-lettuce |
| Coleataenia rigidula ssp. rigidula | redtop panicgrass |
| Colutea arborescens | bladder senna |
| Comandra umbellata ssp. californica | California comandra |
| Comastoma tenellum | slender gentian |
| Conringia orientalis | hare's-ear mustard |
| Consolida orientalis | Oriental knight's-spur |
| Conyza bonariensis | hairy horseweed |
| Coreopsis verticillata | threadleaf coreopsis |
| Corispermum americanum | American bugseed |
| Corispermum hookeri var. hookeri | Hooker's bugseed |
| Corispermum hookeri var. pseudodeclinatum | British Columbia bugseed |
| Corispermum pacificum | Pacific bugseed |
| Corrigiola litoralis ssp. litoralis | strapwort |
| Corydalis aurea ssp. aurea | golden corydalis |
| Corylus cornuta ssp. californica | beaked hazelnut |
| Corynephorus canescens | gray clubawn grass |
| Cotoneaster crispii | cotoneaster |
| Cotoneaster dammeri | bearberry cotoneaster |
| Cotoneaster dielsianus | Diel's cotoneaster |
| Cotoneaster divaricatus | spreading cotoneaster |
| Cotoneaster hybridus pendulus | cotoneaster |
| Cotoneaster lacteus | late cotoneaster |
| Cotoneaster lucidus | Shiny cotoneaster |
| Cotoneaster qungbixiensis | cotoneaster |
| Cotoneaster salicifolius | willow-leaved cotoneaster |
| Cotoneaster sternianus | Stern's cotoneaster |
| Cotoneaster tengyuehensis | cotoneaster |
| Cotoneaster x crispii | cotoneaster |
| Cotoneaster x suecicus | cotoneaster |
| Cotoneaster x watereri | cotoneaster |
| Cotula australis | Australian waterbuttons |
| Crataegus atrovirens | dark-green hawthorn |
| Crataegus castlegarensis | Castlegar hawthorn |
| Crataegus chrysocarpa var. chrysocarpa | fireberry hawthorn |
| Crataegus chrysocarpa var. vernonensis | fireberry hawthorn |
| Crataegus douglasii var. douglasii | black hawthorn |
| Crataegus douglasii var. suksdorfii | black hawthorn |
| Crataegus enderbyensis | Enderby hawthorn |
| Crataegus monogyna var. monogyna | common hawthorn |
| Crataegus okanaganensis var. longispina | Okanagan hawthorn |
| Crataegus okanaganensis var. okanaganensis | Okanagan hawthorn |
| Crataegus okanaganensis var. wellsii | Okanagan hawthorn |
| Crataegus okennonii | O'Kennon's hawthorn |
| Crataegus orbicularis | round-leaved hawthorn |
| Crataegus phaenopyrum | Washington hawthorn |
| Crataegus phippsii | Phipps' hawthorn |
| Crataegus sheila-phippsiae var. sheila-phippsiae | Sheila Phipps' hawthorn |
| Crataegus shuswapensis | Shuswap hawthorn |
| Crataegus tenuior | slender red hawthorn |
| Crepis acuminata ssp. acuminata | long-leaved hawksbeard |
| Crepis nicaeensis | French hawksbeard |
| Crepis occidentalis ssp. conjuncta | western hawksbeard |
| Crepis occidentalis ssp. pumila | western hawksbeard |
| Crepis setosa | bristly hawksbeard |
| Crepis vesicaria | weedy hawksbeard |
| Crepis vesicaria ssp. taraxacifolia | weedy hawksbeard |
| Crocus tommasinianus | woodland crocus |
| Crocus vernus | spring crocus |
| Crypsis alopecuroides | foxtail pricklegrass |
| Cryptantha affinis | common cryptantha |
| Cryptantha ambigua | obscure cryptantha |
| Cryptantha intermedia | Clearwater Cat's-eye |
| Cryptantha watsonii | Watson's cryptantha |
| Cryptogramma sitchensis | Sitka parsley fern |
| Cucumis melo | cantaloupe |
| Cucurbita pepo | field pumpkin |
| Cuscuta campestris | field dodder |
| Cuscuta cephalanthi | button-bush dodder |
| Cycloloma atriplicifolium | winged pigweed |
| Cydonia oblonga | quince |
| Cynara cardunculus ssp. cardunculus | TBD |
| Cynara scolymus | globe artichoke |
| Cynodon dactylon var. dactylon | Bermuda grass |
| Cyperus acuminatus | taper-tip flatsedge |
| Cyperus eragrostis | tall flatsedge |
| Cyperus esculentus | yellow nut-grass |
| Cyperus esculentus var. leptostachyus | yellow nut-grass |
| Cyperus retrorsus | pine barren flatsedge |
| Cyperus strigosus | straw-coloured flatsedge |
| Cypripedium x columbianum | Columbia lady's-slipper |
| Cytisus monspessulanus | TBD |
| Cytisus multiflorus | white spanishbroom |
| Cytisus striatus | Portuguese broom |
| Cytisus villosus | hairybroom |
| Daboecia cantabrica | TBD |
| Danthonia intermedia ssp. intermedia | timber oatgrass |
| Danthonia unispicata | one-spike oatgrass |
| Datura innoxia | angel's trumpet |
| Delphinium elatum | larkspur |
| Deschampsia cespitosa ssp. beringensis | tufted hairgrass |
| Descurainia incana | Richardson's tansy mustard |
| Descurainia incisa ssp. incisa | Richardson's tansymustard |
| Descurainia nelsonii | Nelson's tansymustard |
| Deutzia scabra "Plena" | fuzzy pride-of-Rochester |
| Dianthus armeria ssp. armeria | Deptford pink |
| Dianthus barbatus ssp. barbatus | sweet William |
| Dianthus deltoides ssp. deltoides | maiden pink |
| Dianthus gratianopolitanus | Cheddar pink |
| Dicentra formosa ssp. formosa | Pacific bleeding heart |
| Dieteria canescens var. canescens | hoary aster |
| Diplotaxis muralis | annual wallrocket |
| Dipsacus fullonum | Fuller's Teasel |
| Dipsacus laciniatus | cutleaf teasel |
| Distichlis spicata var. stricta | alkali saltgrass |
| Dodecatheon hendersonii ssp. hendersonii | broad-leaved shootingstar |
| Dodecatheon jeffreyi ssp. jeffreyi | Jeffrey's shootingstar |
| Doronicum plantagineum | plantain-leaved leopard's-bane |
| Doronicum x plantagineum | plantain-leaved leopard's-bane |
| Downingia elegans | common downingia |
| Draba chamissonis | Cape Thompson draba |
| Draba corymbosa | Baffin Bay draba |
| Draba franktonii | Frankton's draba |
| Draba juvenilis | long-stalked draba |
| Draba lonchocarpa var. lonchocarpa | lance-fruited draba |
| Draba lonchocarpa var. vestita | lance-fruited draba |
| Draba macounii | Macoun's draba |
| Draba palanderiana | Palander's draba |
| Draba ruaxes | coast mountain draba |
| Draba scotteri | Scotter's whitlowgrass |
| Draba stenopetala | star-flowered draba |
| Draba taylori | Taylor's draba |
| Draba taylorii | Taylor's draba |
| Draba thompsonii | lance-fruited draba |
| Draba ventosa | Wind River draba |
| Dracocephalum thymiflorum | Eurasian dragonhead |
| Dracopis amplexicaulis | clasping coneflower |
| Drosera x obovata | hybrid sundew |
| Dryas ajanensis ssp. beringensis | white dryad |
| Dryas incisa | crenulate-leaved mountain avens |
| Dryas integrifolia ssp. sylvatica | entire-leaved mountain-avens |
| Drymocallis glandulosa var. glandulosa | sticky cinquefoil |
| Dryopteris filix-mas ssp. filix-mas | male fern |
| Duchesnea indica var. indica | mock strawberry |
| Dulichium arundinaceum var. arundinaceum | three-way sedge |
| Echinochloa muricata | rough barnyardgrass |
| Echinochloa muricata var. microstachya | rough barnyardgrass |
| Echinops exaltatus | tall globethistle |
| Ehrharta erecta | panic veldt grass |
| Elaeagnus multiflora | cherry silverberry |
| Elatine brachysperma | short-seeded waterwort |
| Elatine rubella | three-flowered waterwort |
| Eleocharis atropurpurea | purple spike-rush |
| Eleocharis compressa | Unknown |
| Eleocharis compressa var. compressa | flat-stemmed spike-rush |
| Eleocharis erythropoda | bald spike-rush |
| Eleocharis geniculata | bent spike-rush |
| Eleocharis kamtschatica | Kamchatka spike-rush |
| Eleocharis macrostachya | creeping spike-rush |
| Eleocharis ovata | ovate spikerush |
| Eleocharis parvula | small spike-rush |
| Eleocharis suksdorfiana | Suksdorf's spike-rush |
| Eleocharis tenuis | TBD |
| Eleocharis tenuis var. verrucosa | slender spikerush |
| Eleocharis uniglumis | creeping spike-rush |
| Eleusine indica | goosegrass |
| Elodea callitrichoides | South American waterweed |
| Elodea nuttallii | Nuttall's waterweed |
| Elymus alaskanus ssp. alaskanus | Alaska wild rye |
| Elymus canadensis var. brachystachys | short-spike wildrye |
| Elymus canadensis var. canadensis | Canada wildrye |
| Elymus dahuricus var. dahuricus | TBD |
| Elymus elymoides ssp. brevifolius | squirreltail |
| Elymus elymoides ssp. californicus | squirreltail grass |
| Elymus glaucus ssp. virescens | blue wildrye |
| Elymus lanceolatus ssp. lanceolatus | thickspike wildrye |
| Elymus lanceolatus ssp. psammophilus | sand-dune wheatgrass |
| Elymus lanceolatus ssp. riparius | streambank wheatgrass |
| Elymus scribneri | Scribner's wildrye |
| Elymus trachycaulus ssp. subsecundus | slender wheatgrass |
| Elymus x hansenii | Hansen's wildrye |
| Elymus x saundersii | Saunder's wildrye |
| Enemion savilei | Queen Charlotte false rue-anemone |
| Epilobium angustifolium ssp. circumvagum | fireweed |
| Epilobium ciliatum ssp. watsonii | purple-leaved willowherb |
| Epilobium davuricum | northern swamp willowherb |
| Epilobium glareosum | TBD |
| Epilobium hornemannii ssp. behringianum | Hornemann's willowherb |
| Epilobium komarovianum | creeping willowherb |
| Epilobium obscurum | obscure willow-herb |
| Epilobium oregonense | Oregon willowherb |
| Epilobium tetragonum | Square-stemmed Willowherb |
| Epilobium tetragonum ssp. tetragonum | square-stemmed willow-herb |
| Equisetum x ferrissii | Ferriss' scouring-rush |
| Equisetum x font-queri | Skye horsetail |
| Equisetum x litorale | shore horsetail |
| Equisetum x mackaii | Mackay's scouring-rush |
| Eragrostis curvula | weeping lovegrass |
| Eragrostis mexicana | Mexican Love Grass |
| Eragrostis mexicana ssp. mexicana | Mexican lovegrass |
| Eragrostis mexicana ssp. virescens | Orcutt's lovegrass |
| Eragrostis multicaulis | duo gan hua mei cao |
| Eragrostis pectinacea var. pectinacea | tufted lovegrass |
| Eragrostis pilosa var. pilosa | India lovegrass |
| Eragrostis tef | teff |
| Erechtites hieraciifolia | American burnweed |
| Eremopyrum orientale | Oriental false wheatgrass |
| Eremopyrum triticeum | annual wheatgrass |
| Erica cinerea | bell heather |
| Ericameria bloomeri | rabbitbrush goldenweed |
| Erigeron acris var. kamtschaticus | bitter fleabane |
| Erigeron glacialis var. glacialis | subalpine daisy |
| Erigeron leibergii | Leiberg's fleabane |
| Erigeron peregrinus var. peregrinus | wandering daisy |
| Erigeron philadelphicus var. glaber | salt marsh Philadelphia fleabane |
| Eriogonum heracleoides var. heracleoides | parsnip-flowered buckwheat |
| Eriogonum heracleoides var. leucophaeum | parsnip-flowered buckwheat |
| Eriophorum callitrix | arctic cotton-grass |
| Eriophorum chamissonis var. albidum | Chamisso's cotton-grass |
| Eriophorum chamissonis var. chamissonis | Chamisso's cotton-grass |
| Eriophorum scheuchzeri ssp. scheuchzeri | Scheuchzer's cotton-grass |
| Eriophorum vaginatum ssp. vaginatum | sheathed cotton-grass |
| Eriophorum virginicum | tawny cotton-grass |
| Erodium moschatum | musky storks bill |
| Eruca vesicaria | garden rocket |
| Eruca vesicaria ssp. sativa | rocketsalad |
| Eryngium planum | plains eryngo |
| Erysimum arenicola var. torulosum | sand-dwelling wallflower |
| Erysimum capitatum | western wallflower |
| Erysimum capitatum var. purshii | Pursh's wallflower |
| Erysimum repandum | spreading wallflower |
| Erythranthe arvensis | western monkey-flower |
| Erythranthe decora | northwestern monkey-flower |
| Erythranthe microphylla | small-leaved monkey-flower |
| Erythranthe moschata | musk-flower |
| Erythranthe nasuta | little yellow monkey-flower |
| Erythranthe ptilota | musk-flower |
| Erythranthe scouleri | Columbia River monkey-flower |
| Eupatorium altissimum | tall boneset |
| Euphorbia characias | Albanian spurge |
| Euphorbia marginata | snow on the mountain |
| Euphorbia oblongata | eggleaf spurge |
| Euphorbia serpens | matted sandmat |
| Euphorbia serrulata | upright spurge |
| Euphorbia vermiculata | TBD |
| Euphrasia stricta | stiff eyebright |
| Fagopyrum tataricum | Tatary buckwheat |
| Fallopia baldschuanica | silver lace vine |
| Festuca altaica | Altai fescue |
| Festuca baffinensis | Baffin fescue |
| Festuca cinerea | blue fescue |
| Festuca filiformis | hair fescue |
| Festuca heterophylla | various-leaved fescue |
| Festuca minutiflora | little fescue |
| Festuca ovina | sheep fescue |
| Festuca pseudovivipara | pseudoviviparous fescue |
| Festuca rubra ssp. arctica | Arctic red fescue |
| Festuca rubra ssp. aucta | Aleut fescue |
| Festuca rubra ssp. commutata | Chewing's fescue |
| Festuca rubra ssp. fallax | flatleaf red fescue |
| Festuca rubra ssp. mediana | dwarf red fescue |
| Festuca rubra ssp. pruinosa | rock fescue |
| Festuca rubra ssp. secunda | Secund red fescue |
| Festuca rubra ssp. vallicola | mountain red fescue |
| Festuca saximontana var. purpusiana | Rocky Mountain fescue |
| Festuca saximontana var. robertsiana | Rocky Moutain fescue |
| Festuca saximontana var. saximontana | Rocky Mountain fescue |
| Festuca viviparoidea ssp. krajinae | viviparous fescue |
| Festuca washingtonica | Washington fescue |
| Fragaria x ananassa ssp. cuneifolia | Pacific Northwest hybrid strawberry |
| Fragaria x ananassa var. ananassa | garden strawberry |
| Fragaria x ananassa var. cuneifolia | garden strawberry |
| Frangula purshiana ssp. purshiana | cascara |
| Fraxinus pennsylvanica | green ash |
| Fuchsia magellanica | Magellan fuchsia |
| Fumaria muralis | wall fumitory |
| Galega officinalis | French lilac |
| Galinsoga parviflora var. parviflora | small-flowered galinsoga |
| Galium anglicum | Lamarck's bedstraw |
| Galium divaricatum | Lamarck's bedstraw |
| Galium murale | tiny bedstraw |
| Galium spurium | false cleavers |
| Galium trifidum ssp. columbianum | small bedstraw |
| Galium trifidum ssp. trifidum | small bedstraw |
| Gamochaeta pensylvanica | Pennsylvania everlasting |
| Gaura lindheimeri | pink gaura |
| Gaura mollis | velvetweed |
| Gayophytum ramosissimum | hairstem groundsmoke |
| Gentiana affinis var. affinis | prairie gentian |
| Gentianella tenella ssp. tenella | slender gentian |
| Geranium pyrenaicum ssp. pyrenaicum | hedgerow geranium |
| Geranium sibiricum | Siberian geranium |
| Geum schofieldii | Queen Charlotte avens |
| Gilia achilleifolia | California gilla |
| Glandularia x hybrida | TBD |
| Glyceria canadensis | rattlesnake-grass |
| Glyceria canadensis var. canadensis | rattlesnake-grass |
| Glyceria declinata | waxy mannagrass |
| Glyceria elata | tall mannagrass |
| Glyceria fluitans | floating sweet-grass |
| Glyceria grandis var. grandis | reed mannagrass |
| Glyceria leptostachya | slender-spiked mannagrass |
| Glyceria x occidentalis | western mannagrass |
| Grindelia hirsutula var. hirsutula | hairy gumweed |
| Guizotia abyssinica | Niger seed |
| Gymnocarpium continentale | Nahanni oak fern |
| Gymnocarpium x intermedium | intermediate oakfern |
| Gypsophila elegans | annual baby's breath |
| Gypsophila muralis | low baby's breath |
| Hackelia deflexa ssp. americana | nodding stickseed |
| Hackelia diffusa var. diffusa | spreading stickseed |
| Hedeoma hispida | mock-pennyroyal |
| Hedera colchica | colchis ivy |
| Hedera hibernica | Atlantic ivy |
| Hedysarum boreale ssp. boreale | northern hedysarum |
| Helenium flexuosum | purple sneezeweed |
| Helianthus maximiliani | Maximilian sunflower |
| Helianthus pauciflorus ssp. subrhomboideus | rhombic-leaved sunflower |
| Helianthus petiolaris | Unknown |
| Helianthus petiolaris ssp. petiolaris | prairie sunflower |
| Helianthus tuberosus | Jerusalem artichoke |
| Helianthus x laetiflorus | TBD |
| Heliopsis helianthoides | Unknown |
| Heliopsis helianthoides var. scabra | false sunflower |
| Helleborus foetidus | stinking hellebore |
| Heterotheca subaxillaris | Unknown |
| Heterotheca subaxillaris ssp. subaxillaris | dune camphorweed |
| Heuchera cylindrica var. glabella | round-leaved alumroot |
| Heuchera cylindrica var. orbicularis | round-leaved alumroot |
| Heuchera cylindrica var. septentrionalis | round-leaved alumroot |
| Hibiscus trionum | flower-of-an-hour |
| Hieracium flagellare ssp. flagellare | flagellate hawkweed |
| Hieracium glomeratum | yellowdevil hawkweed |
| Hieracium inops | TBD |
| Hieracium lactucella | European hawkweed |
| Hieracium laevigatum | smooth hawkweed |
| Hieracium pilosella ssp. micradenium | mouse-ear hawkweed |
| Hierochloe alpina | alpine sweetgrass |
| Hippuris lanceolata | lance-leaved mare's tail |
| Hippuris tetraphylla | four-leaved mare's-tail |
| Holcus mollis | creeping softgrass |
| Holosteum umbellatum ssp. umbellatum | umbellate chickweed |
| Hordeum jubatum ssp. intermedium | foxtail barley |
| Hordeum jubatum ssp. jubatum | foxtail barley |
| Hordeum marinum ssp. gussoneanum | Mediterranean barley |
| Hordeum murinum ssp. glaucum | seagreen barley |
| Hordeum murinum ssp. leporinum | charming barley |
| Hordeum murinum ssp. murinum | wall barley |
| Humulus lupulus var. lupulus | common hop |
| Huperzia continentalis | alpine fir-moss |
| Huperzia selago | northern fir-moss |
| Hyacinthoides non-scripta | English-bluebell |
| Hydrocotyle sibthorpioides | lawn marshpennywort |
| Hylotelephium erythrostictum | garden stonecrop |
| Hylotelephium telephioides | Allegheny stonecrop |
| Hylotelephium telephium | witch's moneybags |
| Hypericum boreale | northern bog St. John's-wort |
| Hypericum ellipticum | pale Saint John's wort |
| Hypericum kouytchense | TBD |
| Hypericum mutilum var. mutilum | small Canadian St. John's-wort |
| Hypericum perforatum ssp. perforatum | common St. John's-wort |
| Iberis sempervirens | evergreen candytuft |
| Ilex x altaclerensis | TBD |
| Illecebrum verticillatum | coral necklace |
| Ionopsidium acaule | false diamondflower |
| Ipomoea hederacea | ivyleaf morning-glory |
| Ipomoea purpurea | tall morning-glory |
| Iris sibirica | Siberian iris |
| Iris versicolor | blue flag |
| Iris x germanica | German iris |
| Isoetes minima | midget quillwort |
| Isoetes occidentalis | western quillwort |
| Isoetes x marensis | Mara Lake quillwort |
| Isoetes x pseudotruncata | northwest coast quillwort |
| Isoetes x truncata | truncated quillwort |
| Isolepis pseudosetacea | Gulf Coast bulrush |
| Jovibarba globifera | TBD |
| Juncus anthelatus | giant path rush |
| Juncus arcticus ssp. alaskanus | arctic rush |
| Juncus balticus ssp. ater | Baltic rush |
| Juncus biglumis | two-flowered rush |
| Juncus breweri | Brewer's rush |
| Juncus bufonius var. bufonius | toad rush |
| Juncus bufonius var. occidentalis | toad rush |
| Juncus compressus | compressed rush |
| Juncus confusus | Colorado rush |
| Juncus drummondii var. drummondii | Drummond's rush |
| Juncus drummondii var. subtriflorus | Drummond's rush |
| Juncus effusus ssp. effusus | European rush |
| Juncus effusus ssp. pacificus | Pacific soft rush |
| Juncus effusus ssp. solutus | soft rush |
| Juncus ensifolius var. ensifolius | dagger-leaf rush |
| Juncus falcatus ssp. sitchensis | sickle-leaved rush |
| Juncus gerardii var. gerardii | Gerard's rush |
| Juncus haenkei | Haenke's rush |
| Juncus hesperius | common rush |
| Juncus laccatus | common rush |
| Juncus marginatus | grass-leaf rush |
| Juncus nevadensis | Sierra rush |
| Juncus nevadensis var. inventus | dune rush |
| Juncus nevadensis var. nevadensis | Sierra rush |
| Juncus occidentalis | western rush |
| Juncus pelocarpus | brown-fruit rush |
| Juncus pylaei | soft rush |
| Juncus regelii | Regel's rush |
| Juncus saximontanus | Tracy's rush |
| Juncus squarrosus | heath rush |
| Juncus stygius var. americanus | bog rush |
| Juniperus communis var. charlottensis | Haida Gwaii juniper |
| Juniperus communis var. depressa | dwarf juniper |
| Juniperus communis var. kelleyi | Kelley's juniper |
| Kalmia microphylla var. microphylla | alpine bog laurel |
| Kobresia sibirica | Siberian kobresia |
| Koenigia polystachya | Himalayan knotweed |
| Kolkwitzia amabilis | beautybush |
| Lactuca canadensis | Canadian wild lettuce |
| Lactuca ludoviciana | western lettuce |
| Lappula fremontii | Fremont's stickseed |
| Lappula montana | montane stickseed |
| Lappula occidentalis var. occidentalis | western stickseed |
| Lappula occidentalis var. stricta | western stickseed |
| Lathrocasis tenerrima | slender gilia |
| Lathyrus lanszwertii var. bijugatus | pinewood peavine |
| Leersia oryzoides | rice cutgrass |
| Lemna minuta | least duckweed |
| Lemna turionifera | Turion duckweed |
| Leonurus quinquelobatus | TBD |
| Lepidium chalepense | Chalapa hoarycress |
| Lepidium oxycarpum | sharp-pod peppergrass |
| Lepidium sativum | garden cress |
| Lepidium virginicum ssp. menziesii | Menzies' pepperweed |
| Lepidium virginicum var. menziesii | Menzies' pepperweed |
| Leptochloa fusca | Bearded Sprangletop |
| Leptochloa fusca ssp. uninervia | Mexican sprangletop |
| Leucanthemella serotina | giantdaisy |
| Leucanthemum maximum | Shasta daisy |
| Lewisia rediviva var. rediviva | bitterroot |
| Leymus innovatus ssp. innovatus | fuzzy-spiked wildrye |
| Liatris punctata | dotted blazing star |
| Ligusticum calderi | Calder's lovage |
| Ligusticum scoticum ssp. hultenii | beach lovage |
| Ligustrum amurense | Amur privet |
| Lilium lancifolium | tiger lily |
| Limnanthes douglasii | poached egg plant |
| Linaria maroccana | baby snapdragon |
| Linaria pinifolia | pineneedle toadflax |
| Lindernia dubia var. anagallidea | false-pimpernel |
| Linum bienne | pale flax |
| Lipandra polysperma var. acutifolia | European goosefoot |
| Lithophragma tenellum | slender fringecup |
| Lithophragma thompsonii | Thompson's woodland-star |
| Lloydia serotina var. flava | alp lily |
| Lobelia erinus | garden lobelia |
| Lobelia siphalitica | great blue lobelia |
| Lolium persicum | Persian ryegrass |
| Lolium temulentum | bearded ryegrass |
| Lomatium foeniculaceum var. foeniculaceum | fennel-leaved desert-parsley |
| Lomatium martindalei var. angustatum | Martindale's desert-parsley |
| Lomatium martindalei var. flavum | Martindale's desert-parsley |
| Lomatium simplex | Great Basin desert-parsley |
| Lomatium triternatum ssp. platycarpum | nine-leaved desert-parsley |
| Lonicera acuminata | TBD |
| Lonicera dioica var. glaucescens | glaucous-leaved honeysuckle |
| Lonicera involucrata var. involucrata | black twinberry |
| Lotus krylovii | Krylov's trefoil |
| Lupinus angustifolius | narrowleaf lupine |
| Lupinus bingenensis var. subsaccatus | Suksdorf's lupine |
| Lupinus depressus | depressed lupine |
| Lupinus formosus | summer lupine |
| Lupinus latifolius var. latifolius | broadleaf lupine |
| Lupinus leucophyllus var. leucophyllus | velvet lupine |
| Lupinus luteus | European yellow lupine |
| Lupinus microcarpus var. microcarpus | dense-flowered lupine |
| Lupinus nanus ssp. nanus | sky lupine |
| Lupinus oreganus | Oregon Lupine |
| Lupinus oreganus var. kincaidii | Kincaid's lupine |
| Lupinus polyphyllus var. pallidipes | bigleaf lupine |
| Lupinus polyphyllus var. polyphyllus | large-leaved lupine |
| Lupinus sericeus var. sericeus | silky lupine |
| Luzula arcuata | Curved Woodrush |
| Luzula arcuata ssp. unalaschcensis | curved wood-rush |
| Luzula campestris | field wood-rush |
| Luzula campestris ssp. campestris | field wood-rush |
| Luzula comosa var. laxa | Pacific wood-rush |
| Luzula fastigiata | forked wood-rush |
| Luzula macrantha | prairie woodrush |
| Luzula multiflora ssp. frigida | many-flowered wood-rush |
| Luzula nivalis | arctic wood-rush |
| Luzula nivea | TBD |
| Luzula parviflora ssp. parviflora | small-flowered wood-rush |
| Luzula subsessilis | short-stalked wood-rush |
| Lycium chinense | Chinese matrimony vine |
| Lycopodium clavatum var. clavatum | running club-moss |
| Lysimachia europaea | Arctic starflower |
| Lysimachia latifolia | broad-leaved starflower |
| Lysimachia verticillaris | yellow loosestrife |
| Lythrum alatum | winged lythrum |
| Lythrum hyssopifolia | Hyssop loosestrife |
| Malus baccata | Siberian crab apple |
| Malus hupehensis | tea crabapple |
| Malus prunifolia | plumleaf crabapple |
| Malva parviflora | small-flowered mallow |
| Malva verticillata | Chinese mallow |
| Matteuccia struthiopteris var. pensylvanica | ostrich fern |
| Matthiola incana | stock |
| Megalodonta beckii | water marigold |
| Melilotus indica | annual yellow sweetclover |
| Melilotus sulcatus | Mediterranean sweetclover |
| Mentha canadensis | Canada mint |
| Mentha cervina | Hart's pennyroyal |
| Mentha longifolia | Unknown |
| Mentha longifolia ssp. longifolia | horse mint |
| Mentha requienii | Corsican mint |
| Mentha suaveolens | applemint |
| Mentha x gracilis | red mint |
| Mentha x verticillata | whorled mint |
| Mentha x villosa | foxtail mint |
| Mertensia maritima var. asiatica | sea bluebells |
| Mertensia oblongifolia | oblong-leaved bluebells |
| Micranthes nelsoniana var. pacifica | dotted saxifrage |
| Micranthes nivalis | alpine saxifrage |
| Micromeria graeca | Unknown |
| Micromeria graeca ssp. fruticulosa | pink micromeria |
| Mimulus microphyllus | seep monkey-flower |
| Minuartia macrocarpa | longpod stitchwort |
| Mirabilis albida | hairy umbrellawort |
| Miscanthus sinensis | TBD |
| Moenchia erecta ssp. erecta | upright chickweed |
| Molinia caerulea | purple moor grass |
| Monarda fistulosa var. mollis | wild bergamot |
| Montia bostockii | Bostock's montia |
| Montia diffusa | branching montia |
| Muhlenbergia mexicana | wirestem muhly |
| Muhlenbergia mexicana var. mexicana | wirestem muhly |
| Muhlenbergia racemosa | satin grass |
| Muhlenbergia uniflora | bog muhly |
| Muscari armeniacum | Armenian grape hyacinth |
| Muscari aucheri | Aucher-Eloy grape hyacinth |
| Muscari neglectum | starch grape hyacinth |
| Myosotis verna | spring forget-me-not |
| Myosurus apetalus var. borealis | bristly mousetail |
| Myriophyllum farwellii | Farwell's water-milfoil |
| Myriophyllum heterophyllum | varied-leaved watermilfoil |
| Myriophyllum hippuroides | western water-milfoil |
| Myriophyllum pinnatum | green parrot's-feather |
| Myriophyllum quitense | waterwort water-milfoil |
| Narcissus x incomparabilis | TBD |
| Nassella tenuissima | Mexican feather grass |
| Navarretia divaricata ssp. divaricata | mountain navarretia |
| Nicotiana alata | winged tobacco |
| Nicotiana langsdorffii | tobacco |
| Nicotiana quadrivalvis | Indian tobacco |
| Nicotiana sylvestris | flowering tobacco |
| Nigella damascena | love-in-a-mist |
| Nonea vesicaria | red monkswort |
| Nothoscordum bivalve | false garlic |
| Nuttallanthus canadensis | Canada toadflax |
| Nymphaea leibergii | small white waterlily |
| Nymphaea odorata ssp. odorata | fragrant waterlily |
| Nymphaea x marliacea | TBD |
| Oenothera curtiflora | TBD |
| Oenothera macrocarpa ssp. macrocarpa | bigfruit evening primrose |
| Oenothera oakesiana | Oakes' evening primrose |
| Oenothera perennis | perennial sundrops |
| Oenothera stricta ssp. stricta | TBD |
| Oenothera villosa ssp. villosa | hairy evening-primrose |
| Omalotheca sylvatica | woodland cudweed |
| Onopordum acanthium | Scotch thistle |
| Ophioglossum petiolatum | stalked adder's tongue |
| Oreocarya glomerata | cock's-comb cryptantha |
| Origanum heracleoticum | Greek oregeno |
| Orthilia secunda var. obtusata | one-sided wintergreen |
| Oxalis debilis var. corymbosa | pink woodsorrel |
| Oxalis dillenii | graygreen sorrel |
| Oxalis exilis | shady woodsorrel |
| Oxalis montana | white wood-sorrel |
| Oxybasis chenopodioides | low goosefoot |
| Oxybasis glauca ssp. salina | Rocky Mountain goosefoot |
| Oxybasis glauca ssp.glauca | oak-leaved goosefoot |
| Oxybasis macrosperma | large-seeded goosefoot |
| Oxybasis rubra var. humilis | red goosefoot |
| Oxybasis rubra var. rubra | red goosefoot |
| Oxytropis deflexa var. sericea | silky oxytrope |
| Oxytropis sericea var. speciosa | pretty oxytrope |
| Packera ogotorukensis | Ogotoruk Creek butterweed |
| Panicum dichotomiflorum ssp. dichotomiflorum | smooth witchgrass |
| Panicum miliaceum ssp. miliaceum | broomcorn millet |
| Panicum miliaceum ssp. ruderale | broomcorn millet |
| Panicum rigidulum | Redtop Panic Grass |
| Panicum rigidulum ssp. rigidulum | redtop panicgrass |
| Papaver atlanticum | Moroccan poppy |
| Papaver croceum | ice poppy |
| Papaver dubium | blind eyes |
| Parietaria hespera | Unknown |
| Parietaria hespera var. hespera | rillita pellitory |
| Pascopyrum smithii | western bluegrass |
| Paspalum dilatatum | dallisgrass |
| Pectocarya penicillata | winged combseed |
| Pedicularis macrodonta | muskeg lousewort |
| Pedicularis pennellii | Pennell's lousewort |
| Pellaea breweri | Brewer's cliff-brake |
| Pennisetum alopecuroides | Chinese fountaingrass |
| Penstemon richardsonii var. richardsonii | Richardson's penstemon |
| Pentaglottis sempervirens | green alkanet |
| Pentagramma triangularis ssp. triangularis | goldenback fern |
| Perideridia montana | common yampeh |
| Perilla frutescens var. crispa | beefsteakplant |
| Perilla frutescens var. frutescens | beefsteakplant |
| Perovskia atriplicifolia | Russian sage |
| Persicaria nepalensis | Nepalese knotweed |
| Persicaria orientalis | princess feather |
| Persicaria perfoliata | mile-a-minute weed |
| Petasites frigidus var. nivalis | sweet coltsfoot |
| Petasites frigidus var. x vitifolius | vine-leaved coltsfoot |
| Petrorhagia nanteuilii | proliferous pink |
| Petunia x atkinsiana | TBD |
| Phacelia hastata var. hastata | silverleaf phacelia |
| Phacelia heterophylla ssp. virgata | varied-leaf phacelia |
| Phacelia heterophylla var. virgata | varied-leaf phacelia |
| Phacelia sericea var. ciliosa | silky phacelia |
| Phacelia sericea var. sericea | silky phacelia |
| Phalaris arundinacea var. arundinacea | reed canarygrass |
| Phalaris arundinacea var. picta | ornamental reed canarygrass |
| Phalaris canariensis | canarygrass |
| Phalaris minor | littleseed canarygrass |
| Phaseolus vulgaris | kidney bean |
| Phleum pratense ssp. pratense | common timothy |
| Phragmites australis ssp. australis | common reed |
| Phyllodoce x intermedia | intermediate mountain heather |
| Phyllostachys aurea | golden bamboo |
| Physalis alkekengi | Chinese lantern |
| Physalis grisea | strawberry-tomato |
| Physalis longifolia var. longifolia | longleaf groundcherry |
| Physalis peruviana | Peruvian groundcherry |
| Physalis philadelphica | Tomatillo |
| Physalis pubescens | TBD |
| Physaria didymocarpa ssp. didymocarpa | common twinpod |
| Picea x lutzii | Roche spruce |
| Picris echioides | bristly ox-tongue |
| Picris hieracioides ssp. hieracioides | bristly ox-tongue |
| Pilosella flagellaris | whiplash hawkweed |
| Pilosella glomerata | yellowdevil hawkweed |
| Pilosella piloselloides | tall hawkweed |
| Pilosella x floribunda | kingdevil hawkweed |
| Pinguicula vulgaris ssp. macroceras | common butterwort |
| Pinus ponderosa var. ponderosa | ponderosa pine |
| Pinus ponderosa var. scopulorum | Rocky Mountain ponderosa pine |
| Pinus ponderosa var.scopulorum | ponderosa pine |
| Plagiobothrys cognatus | sleeping popcornflower |
| Plagiobothrys cusickii | Cusick's popcornflower |
| Plagiobothrys figuratus ssp. figuratus | fragrant popcornflower |
| Plagiobothrys hispidulus | harsh popcornflower |
| Plantago aristata | largebracted plantain |
| Plantago ovata | desert Indianwheat |
| Plantago psyllium | whorled plantain |
| Platanthera dilatata var. albiflora | fragrant white rein orchid |
| Platanthera elegans ssp. elegans | elegant rein orchid |
| Poa abbreviata ssp. pattersonii | abbreviated bluegrass |
| Poa arctica | arctic bluegrass |
| Poa arctica ssp. arctica | arctic bluegrass |
| Poa arctica ssp. lanata | arctic bluegrass |
| Poa cusickii ssp. epilis | Cusick's bluegrass |
| Poa cusickii ssp. pallida | Cusick's bluegrass |
| Poa fendleriana ssp. fendleriana | mutton grass |
| Poa glauca ssp. glauca | glaucous bluegrass |
| Poa glauca ssp. rupicola | glaucous bluegrass |
| Poa infirma | diploid annual bluegrass |
| Poa laxa | Wavy blue grass |
| Poa laxa ssp. banffiana | Banff bluegrass |
| Poa laxiflora | lax-flowered bluegrass |
| Poa leptocoma | bog bluegrass |
| Poa lettermanii | Letterman's bluegrass |
| Poa nemoralis ssp. nemoralis | woods bluegrass |
| Poa pratensis ssp. agassizensis | Kentucky bluegrass |
| Poa pratensis ssp. alpigena | Kentucky bluegrass |
| Poa pratensis ssp. angustifolia | Kentucky bluegrass |
| Poa pratensis ssp. colpodea | Kentucky bluegrass |
| Poa pratensis ssp. irrigata | Kentucky bluegrass |
| Poa pratensis ssp. pratensis | Kentucky bluegrass |
| Poa pseudoabbreviata | polar bluegrass |
| Poa secunda ssp. juncifolia | Nevada bluegrass |
| Poa secunda ssp. secunda | Sandberg's bluegrass |
| Poa stenantha | narrow-flowered bluegrass |
| Poa stenantha var. stenantha | narrow-flowered bluegrass |
| Poa suksdorfii | Suksdorf's bluegrass |
| Poa supina | supine bluegrass |
| Polemonium californicum | California Jacob's ladder |
| Polemonium villosissimum | Alaska Jacob's-ladder |
| Polycnemum arvense | crunch weed |
| Polygala vulgaris | common milkwort |
| Polygonum arenastrum | oval-leaved knotweed |
| Polygonum buxiforme | eastern knotweed |
| Polygonum engelmannii | Engelmann's knotweed |
| Polygonum humifusum ssp. caurianum | Alaska knotweed |
| Polygonum neglectum | narrow-leaved knotweed |
| Polygonum nuttallii | Nuttall's knotweed |
| Polygonum perfoliatum | Asiatic tearthumb |
| Polygonum ramosissimum ssp. prolificum | proliferous knotweed |
| Polygonum ramosissimum ssp. ramosissimum | bushy knotweed |
| Polygonum rurivagum | narrow-leaved knotweed |
| Polygonum sawatchense ssp. oblivium | Sawatch knotweed |
| Polypogon fugax | Asia Minor bluegrass |
| Polypogon interruptus | ditch rabbit's-foot grass |
| Polypogon viridis | beardless rabbitsfoot grass |
| Populus deltoides ssp. deltoides | eastern cottonwood |
| Populus deltoides ssp. monilifera | eastern cottonwood |
| Populus grandidentata | large-tooth aspen |
| Populus x canescens | grey poplar |
| Potamogeton foliosus | closed-leaved pondweed |
| Potamogeton friesii | flat-stalked pondweed |
| Potamogeton illinoensis | Illinois pondweed |
| Potamogeton nodosus | long-leaved pondweed |
| Potamogeton pusillus ssp. pusillus | small pondweed |
| Potamogeton pusillus ssp. tenuissimus | small pondweed |
| Potamogeton zosteriformis | eel-grass pondweed |
| Potentilla anserina ssp. anserina | common silverweed |
| Potentilla anserina ssp. pacifica | Pacific silverweed |
| Potentilla arenosa ssp. arenosa | scree cinquefoil |
| Potentilla brunnescens | slender cinquefoil |
| Potentilla furcata | forked cinquefoil |
| Potentilla glaucophylla var. glaucophylla | blue-leaved cinquefoil |
| Potentilla glaucophylla var. perdissecta | diverse-leaved cinquefoil |
| Potentilla hookeriana ssp. hookeriana | Hooker's cinquefoil |
| Potentilla hyparctica ssp. elatior | Arctic cinquefoil |
| Potentilla hyparctica ssp. hyparctica | boreal cinquefoil |
| Potentilla inclinata | ashy cinquefoil |
| Potentilla jepsonii var. kluanensis | Kluane cinquefoil |
| Potentilla nivea var. nivea | snow cinquefoil |
| Potentilla ovina var. decurrens | sheep cinquefoil |
| Potentilla ovina var. ovina | sheep cinquefoil |
| Potentilla rubricaulis | red-stemmed cinquefoil |
| Potentilla subgorodkovii | Beringian cinquefoil |
| Potentilla subvahliana | high arctic cinquefoil |
| Potentilla verna | TBD |
| Potentilla villosula | Alaska cinquefoil |
| Poteridium occidentale | western burnet |
| Primula conjugens var. viscida | slimpod |
| Primula cuneifolia ssp. saxifragifolia | wedge-leaved primrose |
| Primula hendersonii | broad-leaved shootingstar |
| Primula jeffreyi | Jeffrey's shootingstar |
| Primula latiloba | white shootingstar |
| Primula pauciflora var. macrocarpa | Alaskan shootingstar |
| Prunus armeniaca | apricot |
| Prunus domestica | European plum |
| Prunus lusitanica | Portugal laurel |
| Prunus persica | Unknown |
| Prunus serotina var. serotina | black cherry |
| Prunus tomentosa | Nanking cherry |
| Prunus virginiana ssp. demissa | choke cherry |
| Prunus virginiana var. demissa | choke cherry |
| Prunus x pugetensis | hybrid cherry |
| Pseudognaphalium luteoalbum | Jersey cudweed |
| Pseudosasa japonica | arrow bamboo |
| Psilocarphus brevissimus var. brevissimus | dwarf woolly-heads |
| Pteridium aquilinum var. latiusculum | bracken fern |
| Pteridium aquilinum var. pubescens | bracken fern |
| Pyracantha fortuneana | Chinese firethorn |
| Pyrola asarifolia ssp. asarifolia | pink wintergreen |
| Pyrola asarifolia ssp. bracteata | pink wintergreen |
| Pyrus nivalis | snow pear |
| Pysalis peruviana | Cape gooseberry |
| Quercus garryana var. garryana | Garry oak |
| Ranunculus aquatilis var. diffusus | white water-buttercup |
| Ranunculus arcticus | birdfoot buttercup |
| Ranunculus eschscholtzii var. eschscholtzii | subalpine buttercup |
| Ranunculus eschscholtzii var. eximius | tundra buttercup |
| Ranunculus eschscholtzii var. suksdorfii | Suksdorf's buttercup |
| Ranunculus flammula var. ovalis | lesser spearwort |
| Ranunculus grayi | arctic buttercup |
| Ranunculus hebecarpus | delicate buttercup |
| Ranunculus occidentalis var. brevistylis | western buttercup |
| Ranunculus occidentalis var. hexasepalus | Haida buttercup |
| Ranunculus sardous | hairy buttercup |
| Ranunculus sceleratus var. sceleratus | cursed buttercup |
| Ranunculus sulphureus | sulphur buttercup |
| Ranunculus x heimburgerae | Heimburger's buttercup |
| Rapistrum rugosum | bastard cabbage |
| Reseda odorata | common mignonette |
| Rhinanthus glaber | smooth rattle |
| Rhinanthus minor ssp. groenlandicus | Greenland yellow rattle |
| Rhinanthus minor ssp. minor | yellow rattle |
| Ribes rubrum | red currant |
| Ribes watsonianum | spring gooseberry |
| Robinia viscosa | clammy locust |
| Rorippa alpina | alpine yellowcress |
| Rorippa austriaca | Austrian yellowcress |
| Rorippa cantoniensis | Chinese Yellowcress |
| Rorippa globosa | globe yellowcress |
| Rorippa heterophylla | TBD |
| Rorippa indica var. indica | variableleaf yellowcress |
| Rorippa microsperma | TBD |
| Rorippa palustris ssp. hispida | Hispid yellow cress |
| Rorippa palustris ssp. palustris | marsh yellow cress |
| Rorippa sinuata | spreading yellowcress |
| Rorippa tenerrima | yellow cress |
| Rosa gymnocarpa var. gymnocarpa | baldhip rose |
| Rosa nutkana ssp. nutkana | Nootka rose |
| Rosa pisocarpa ssp. pisocarpa | clustered wild rose |
| Rosa woodsii ssp. woodsii | Wood's rose |
| Rotala ramosior | toothcup meadow-foam |
| Rubus leucodermis var. leucodermis | black raspberry |
| Rubus phoenicolasius | Japanese wineberry |
| Rubus vestitus | European blackberry |
| Rudbeckia laciniata | tall coneflower |
| Rudbeckia laciniata var. ampla | tall coneflower |
| Rumex acetosa ssp. acetosa | green sorrel |
| Rumex britannica | greater water dock |
| Rumex californicus | California willow dock |
| Rumex flexuosus | Maori dock |
| Rumex hydrolapathum | TBD |
| Rumex longifolius | long-leaved dock |
| Rumex patientia | patience dock |
| Rumex pseudonatronatus | field dock |
| Rumex rugosus | TBD |
| Rumex sanguineus | red-veined dock |
| Rumex thyrsiflorus | garden sorrel |
| Rumex x pratensis | TBD |
| Sabulina nuttallii var. nuttallii | Nuttall's sandwort |
| Sabulina stricta | rock sandwort |
| Sagina decumbens | Small-flowered Pearlwort |
| Sagina decumbens ssp. occidentalis | western pearlwort |
| Sagina nivalis | snow pearlwort |
| Salix alaxensis var. alaxensis | Alaska willow |
| Salix alaxensis var. longistylis | Alaska willow |
| Salix alba var. vitellina | white willow |
| Salix brachycarpa var. brachycarpa | short-fruited willow |
| Salix cinerea | TBD |
| Salix exigua var. hindsiana | Hind's willow |
| Salix glauca var. acutifolia | grey-leaved willow |
| Salix lasiandra var. caudata | whiplash willow |
| Salix niphoclada | barren-ground willow |
| Salix petrophila | Rocky Mountain willow |
| Salix pulchra | diamond-leaved willow |
| Salix purpurea | purple willow |
| Salix raupii | Raup's willow |
| Salix viminalis | basket willow |
| Salix x fragilis | hybrid white willow |
| Salix x rubens | hybrid white willow |
| Salix x sepulcralis | weeping willow |
| Salpichroa origanifolia | pampas lily-of-the-valley |
| Salpiglossis sinuata | velvet trumpet flower |
| Salsola collina | slender Russian thistle |
| Salvia officinalis | common sage |
| Salvia plebeia | small flowered sage |
| Salvia reflexa | lanceleaf sage |
| Salvia x | TBD |
| Sambucus racemosa var. leucocarpa | eastern red elderberry |
| Sanguisorba annua | western burnet |
| Sanguisorba stipulata | Sitka burnet |
| Sanicula tripartita | three-parted Pacific sanicle |
| Sarracenia purpurea ssp. purpurea | common pitcher-plant |
| Saxifraga granulata | meadow saxifrage |
| Saxifraga nivalis | alpine saxifrage |
| Saxifraga oppositifolia ssp. oppositifolia | purple mountain saxifrage |
| Saxifraga oppositifolia ssp. smalliana | purple mountain saxifrage |
| Saxifraga serpyllifolia | thyme-leaved saxifrage |
| Scabiosa ochroleuca | yellow scabious |
| Schedonnardus paniculatus | Tumblegrass |
| Schizonepeta tenuifolia | Japanese catnip |
| Schoenoplectiella saximontana | Rocky Mountain clubrush |
| Schoenoplectus americanus | Olney's bulrush |
| Schoenoplectus pungens var. longispicatus | American bulrush |
| Schoenoplectus triqueter | streambank clubrush |
| Scilla luciliae | Lucile's glory-of-the-snow |
| Scirpus atrovirens | woolgrass bulrush |
| Scirpus cyperinus | woolgrass |
| Scirpus georgianus | Georgia bulrush |
| Scleranthus annuus ssp. annuus | annual knawel |
| Sclerochloa dura | hardgrass |
| Scrophularia lanceolata | lance-leaved figwort |
| Scutellaria angustifolia ssp. angustifolia | narrowleaf skullcap |
| Sedum lanceolatum var. nesioticum | lance-leaved stonecrop |
| Sedum oreganum ssp. oreganum | Oregon stonecrop |
| Sedum oreganum ssp. tenue | Oregon stonecrop |
| Sedum reflexum | reflexed stonecrop |
| Sedum rupestre | crooked yellow stonecrop |
| Sedum stenopetalum ssp. monanthum | narrow-petal stonecrop |
| Sedum stenopetalum ssp. stenopetalum | worm-leaved stonecrop |
| Sedum thartii | Hart's stonecrop |
| Senecio eremophilus var. eremophilus | dryland ragwort |
| Senecio hydrophilus | alkali-marsh butterweed |
| Senecio leucanthemifolius ssp. vernalis | TBD |
| Senecio x albescens | hybrid ragwort |
| Setaria faberi | Chinese foxtail |
| Setaria italica | foxtail millet |
| Setaria verticilliformis | barbed bristlegrass |
| Setaria viridis var. major | green bristlegrass |
| Setaria viridis var. viridis | green bristlegrass |
| Silene conoidea | weed silene |
| Silene dichotoma | forked catchfly |
| Silene dichotoma ssp. dichotoma | forked catchfly |
| Silene douglasii var. douglasii | Douglas' campion |
| Silene drummondii var. drummondii | Drummond's campion |
| Silene involucrata ssp. involucrata | arctic campion |
| Silene menziesii var. menziesii | Menzies' campion |
| Silene menziesii var. viscosa | Menzies' campion |
| Silene noctiflora | night-flowering catchfly |
| Silene ostenfeldii | Taimyr campion |
| Silene pendula | nodding catchfly |
| Silene scouleri ssp. scouleri | Scouler's campion |
| Silene uralensis ssp. attenuata | nodding campion |
| Sinapis alba | white mustard |
| Sisymbrium orientale | eastern tumble-mustard |
| Sisyrinchium idahoense var. occidentale | Idaho blue-eyed grass |
| Sisyrinchium idahoense var. segetum | Idaho blue-eyed-grass |
| Sisyrinchium montanum var. montanum | mountain blue-eyed-grass |
| Solanum carolinense | Carolina horsenettle |
| Solanum emulans | eastern nightshade |
| Solanum nigrum ssp. schultesii | black nightshade |
| Soldanella montana | mountain snowbells |
| Solidago elongata | west coast goldenrod |
| Solidago gigantea var. shinnersii | smooth goldenrod |
| Sorbaria sorbifolia | false spiraea |
| Sorbus intermedia | Swedish whitebeam |
| Sorghum bicolor | Grain sorghum |
| Sorghum bicolor ssp. bicolor | Grain sorghum |
| Sorghum halepense | Johnsongrass |
| Spartina pectinata | prairie cordgrass |
| Spartina x townsendii | Townsend's cordgrass |
| Spergularia canadensis var. occidentalis | Canadian sand-spurry |
| Spergularia macrotheca var. macrotheca | beach sand-spurry |
| Spergularia rupicola | cliff sand-spurrey |
| Spergularia salina var. salina | salt marsh sand-spurry |
| Sphaeralcea coccinea var. coccinea | scarlet globe-mallow |
| Sphenopholis obtusata | prairie wedgegrass |
| Spinachia oleracea | TBD |
| Spiraea alba | white meadowsweet |
| Spiraea alba var. latifolia | white meadowsweet |
| Spiraea douglasii var. douglasii | hardhack |
| Spiraea splendens var. splendens | subalpine spirea |
| Sporobolus airoides | hairgrass dropseed |
| Sporobolus neglectus | puffsheath dropseed |
| Sporobolus vaginiflorus | Sheathed Dropseed |
| Sporobolus vaginiflorus var. vaginiflorus | poverty grass |
| Stachys arvensis | field hedge-nettle |
| Stellaria alsine | bog starwort |
| Stellaria pallida | lesser chickweed |
| Stuckenia filiformis ssp. filiformis | slender-leaved pondweed |
| Stuckenia filiformis ssp. occidentalis | slender-leaved pondweed |
| Stuckenia vaginata | sheathing pondweed |
| Suaeda linifolia | pin-leaf seepweed |
| Subularia aquatica | Water Awlwort |
| Subularia aquatica ssp. americana | awlwort |
| Symphoricarpos albus var. albus | common snowberry |
| Symphoricarpos oreophilus var. utahensis | mountain snowberry |
| Symphyotrichum cordifolium | heart-leaved aster |
| Symphyotrichum cusickii | Cusick's aster |
| Symphyotrichum falcatum var. commutatum | white prairie aster |
| Symphyotrichum foliaceum var. apricum | alpine leafybract aster |
| Symphyotrichum hendersonii | Henderson's aster |
| Symphyotrichum laeve var. laeve | smooth blue aster |
| Symphyotrichum lanceolatum var. hesperium | western willow aster |
| Symphyotrichum lanceolatum var. lanceolatum | panicled aster |
| Symphyotrichum lateriflorum | calico aster |
| Symphyotrichum novi-belgii | New York aster |
| Symphyotrichum novi-belgii var. novi-belgii | New York aster |
| Symphyotrichum praealtum | willowleaf aster |
| Symphyotrichum spathulatum var. spathulatum | western mountain aster |
| Symphyotrichum x columbianum | Columbia hybrid aster |
| Symphytum asperum | rough comfrey |
| Symphytum ibericum | Iberian comfrey |
| Tanecetum balsamita | costmary |
| Taraxacum hyparcticum | High-Arctic dandelion |
| Taxus baccata | English yew |
| Teline monspessulana | TBD |
| Teucrium canadense var. occidentale | American germander |
| Thelypodium milleflorum | manyflower thelopody |
| Thinopyrum intermedium ssp. barbulatum | hairy wheatgrass |
| Thinopyrum intermedium ssp. intermedium | intermediate wheatgrass |
| Thlaspi macrophyllum | TBD |
| Thymus serpyllum | TBD |
| Tilia platyphyllos | large-leaved lime |
| Torreyochloa pallida | Fernald's false manna |
| Triadenum fraseri | Fraser's St. John's-wort |
| Triantha occidentalis ssp. brevistyla | western false asphodel |
| Triantha occidentalis ssp. montana | western false asphodel |
| Trifolium fragiferum ssp. bonannii | strawberry clover |
| Trifolium fucatum | bull clover |
| Trifolium glomeratum | clustered clover |
| Trifolium resupinatum | reversed clover |
| Triglochin concinna var. concinna | graceful arrow-grass |
| Triglochin concinna var. debilis | slender arrow-grass |
| Triglochin debilis | Slender arrowgrass |
| Trigonella caerulea | blue fenugreek |
| Trigonotis peduncularis | cucumber herb |
| Trisetum cernuum | nodding trisetum |
| Ulmus americana | American elm |
| Ulmus rubra | slippery elm |
| Utricularia ochroleuca | ochroleucous bladderwort |
| Vaccinium uliginosum ssp. occidentale | bog blueberry |
| Vaccinium uliginosum ssp. pubescens | bog blueberry |
| Valeriana edulis var. edulis | edible valerian |
| Valeriana occidentalis | western valerian |
| Veratrum viride var. eschscholzianum | green false-hellebore |
| Verbascum nigrum | dark mullein |
| Verbena bonariensis | tall verbena |
| Verbena hastata var. scabra | blue vervain |
| Verbena urticifolia | Unknown |
| Verbena urticifolia var. urticifolia | white vervain |
| Veronica agrestis | green field speedwell |
| Veronica arguteserrata | sawtooth speedwell |
| Veronica austriaca | Unknown |
| Veronica austriaca ssp. vahlii | Vahl's speedwell |
| Veronica catenata | pink water speedwell |
| Veronica nutans | alpine speedwell |
| Viburnum plicatum | Japanese snowball |
| Viburnum tinus | laurustinus |
| Vicia sativa var. angustifolia | common vetch |
| Vicia villosa var. glabrescens | woolly vetch |
| Viola lanceolata ssp. lanceolata | lance-leaved violet |
| Viola nephrophylla var. cognata | northern bog violet |
| Viola tricolor var. tricolor | Johnny-jump-up |
| Viola x wittrockiana | TBD |
| Vitis riparia | riverbank grape |
| Vitis vinifera | wine grape |
| Vitis x labruscana | grape |
| Vulpia microstachys var. microstachys | desert fescue |
| Vulpia microstachys var. pauciflora | Pacific fescue |
| Wisteria chinensis | TBD |
| Wolffia borealis | northern water-meal |
| Wolffia brasiliensis | Brazilian water-meal |
| Woodsia scopulina ssp. laurentiana | Laurentian woodsia |
| Woodsia scopulina ssp. scopulina | Rocky Mountain woodsia |
| x Elyhordeum macounii | Macoun's wildrye |
| x Elyhordeum stebbinsianum | purple wildrye |
| x Elyleymus hirtiflorus | Canadian wildrye |
| x Elyleymus mossii | Moss's hybrid wheatgrass |
| x Elyleymus uclueletensis | hybrid Ucluelet wildrye |
| x Pseudelymus saxicola | foxtail wheatgrass |
| Xanthium spinosum | spiny cocklebur |
| Yucca filamentosa | TBD |
| Zizania aquatica | wild rice |
| Zizania aquatica var. aquatica | wild rice |
| Zizania palustris | interior wildrice |
| Zizia aptera var. occidentalis | heart-leaved Alexanders |