E-Flora BC: Electronic Atlas of the Flora of British Columbia

Thinopyrum intermedium (Host) Barkworth & D.R. Dewey
intermediate wheatgrass
Poaceae (Grass family)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #10800)

E-Flora BC Static Map
Distribution of Thinopyrum intermedium
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Species Information

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Perennial grass from rhizomes; stems smooth or hairy, 50-115 cm tall.
Sheaths smooth or fringed with fine hairs; blades flat, the margins prominently thickened and hard, smooth on the lower surfaces, sparsely hairy on the upper surfaces, 2-8 mm wide; ligules membranous, 0.1-0.75 mm long; ear-shaped lobes at the leaf-bases 0.5-1.25 mm long.
Inflorescence an erect or lax, terminal spike, 8-21 cm long, with 1 spikelet per node; spikelets 3- to 10-flowered, 11-18 mm long; glumes stiff, blunt, with evident midnerves often forming thick points, 4.5-10 mm long, the margins not transparent; lemmas 7.5-10 mm long, blunt and awnless or rarely with awns up to 5 mm long.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

Flower Colour:
Blooming Period:
Mid Spring
Fruit/Seed characteristics:
Colour: Brown
Present from Spring to Summer
Source:  The USDA

Habitat / Range

Dry roadsides and forests in the montane zone; rare in SW BC, infrequent in SC and SE BC; introduced from Eurasia.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Thinopyrum intermedium

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information
Value / Class




Elevation (metres) 780 1015 1540
Slope Gradient (%) 0 9 63
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
90 136 356
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
1 3 5
Modal Nutrient Regime
Number of field plots
 species was recorded in:
Modal BEC Zone Class
All BEC Zones (# of stations/zone) species was recorded in: IDF(6), MS(2), PP(1)


The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Synonyms and Alternate Names

Agropyron aucheri Boiss.
Agropyron ciliatiflorum Roshev.
Agropyron gentryi Melderis
Agropyron glaucum (Desf. ex DC.) Roemer & J.A. Schultes [anomalous]
Agropyron intermedium
Agropyron intermedium var. trichophorum (Link) Halac.
Agropyron podperae Nabelek
Agropyron pulcherrimum Grossh.
Agropyron trichophorum
Elymus hispidus
Elymus hispidus subsp. barbulatus (Schur) Melderis
Elymus hispidus var. ruthenicus (Griseb.) Dorn
Elymus intermedius (Host) Beauv.
Elytrigia intermedia
Elytrigia intermedia subsp. barbulata (Schur) A. L÷ve
Elytrigia intermedia subsp. intermedia (Host) Nevski [superfluous autonym]
Elytrigia intermedia subsp. trichophora (Link) Tvzel
Thinopyrum intermedium subsp. barbulatum (Schur) Barkworth & D.R. Dewey

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References