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

Leymus mollis (Trin.) Pilg.
Sea Lyme Grass (American dunegrass; dune wildrye; dunegrass)
Poaceae (Grass family)

Introduction to Vascular Plants

© Lise Townsend  Email the photographer   (Photo ID #4800)

E-Flora BC Static Map
Distribution of Leymus mollis
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SUBTAXA PRESENT IN BC
Leymus mollis ssp. mollis

Species Information

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General:
Perennial, tufted grass from thick, ascending rhizomes forming large clumps; stems erect, stout, usually finely but copiously hairy or sometimes smooth above, 50-150 cm tall.
Leaves:
Sheaths open, smooth; blades tough, very finely minutely rough appressed-hairy on the upper surfaces and smooth underneath, with numerous prominent nerves, flat to in-rolled, 6-15 mm wide; ear-shaped lobes usually developed at some leaf-bases; ligules more or less fringed with fine hairs, scarcely 1 mm long.
Flowers:
Inflorescence a stout spike, (10) 15-30 cm long, 1-2 cm wide; spikelets paired, 4- to 6-flowered, unstalked or if occasionally short-stalked then inflorescence slightly compounded, 20-30 (33) mm long; glumes lanceolate, usually soft-hairy but sometimes only sparsely short-hairy, prominently 3- to 6-nerved and flat, at least at the base, usually membranous-margined, long-pointed, mostly nearly equal to the spikelets, 15-25 mm long, awn-tipped; lemmas generally copiously soft-hairy but rarely only sparsely hairy, mostly prominently-nerved, membranous-margined, 10-20 mm long, long-pointed to abruptly slender-tipped, but scarcely awned; anthers 5-9 mm long.
Notes:
A hybrid between Leymus mollis and Elymus glaucus, known only from Ucluelet and Gold River, has been named Leymus x uclueletensis (Bowden) Baum (Elymus x uclueletensis Bowden). A second hybrid, which is infrequent in SW BC, Leymus x vancouverensis (Vasey) Pilger (Elymus vancouverensis Vasey), has been proposed as a hybrid between Leymus mollis and L. triticoides (Buckl.) Pilger. See Hitchcock et al. (1969) for more detailed descriptions of these hybrids.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Moist to mesic sandy or gravelly beaches and shoreline forests in the lowland zone; common in coastal BC; amphiberingian, N to AK, YT and N, E to NF and S to NH, PA, MI, IL and CA; Greenland, E Asia.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Leymus mollis

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

Minimum

Average

Maximum

Elevation (metres) 0 3 15
Slope Gradient (%) 0 7 120
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
0 299 359
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
1 3 7
Modal Nutrient Regime
Class
A
Number of field plots
 species was recorded in:
29
Modal BEC Zone Class
CWH
All BEC Zones (# of stations/zone) species was recorded in: CWH(29)

Climate

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.

Taxonomic and Nomenclatural Links

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General References