Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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James P. Smith, Jr., except as specified

Annual to bamboo-like; roots generally fibrous
Stem generally round, hollow; nodes swollen, solid
Leaves alternate, 2-ranked, generally linear; sheath generally open; ligule membranous or hairy, at blade base
Inflorescence various (of generally many spikelets)
Spikelet: glumes generally 2; florets (lemma, palea, flower) 1–many; lemma generally membranous, sometimes glume-like; palea generally ± transparent, ± enclosed by lemma
Flower generally bisexual, minute; stamens generally 3; stigmas generally 2, generally plumose
Fruit: achene-like grain
Genera in family: 650–900 genera; ± 10,000 species: worldwide; greatest economic importance of any family (wheat, rice, maize, millet, sorghum, sugar cane, forage crops, ornamental, weeds; thatching, weaving, building materials)
Reference: [Hitchcock 1951 Manual grasses US, USDA Misc Publ 200; Clayton & Renvoise 1986 Kew Bull Add Series 13]
See Glossary p. 26 for illustrations of general family characteristics. Generally wind-pollinated.


Mary E. Barkworth

Perennial, sometimes from rhizomes
Stem generally bent at base or erect, generally tufted
Leaf: sheath appendaged, appendages sometimes small, fragile; ligule membranous, truncate to obtuse; blades flat, folded, or rolled
Inflorescence spike-like, open to dense; axis generally not breaking apart in fruit; spikelets ± 2-ranked or not, 1–4 per node, generally ascending
Spikelet: glumes lanceolate to awl-like, sometimes 0, awned from tip or not; florets 1–7; lemma generally > glumes, generally rounded, tip acute to awned, awn straight or curved outward; anthers 1–6 mm
Species in genus: 150 species: temp worldwide
Etymology: (Greek: ancient name for millet)
Reference: [Barkworth & Dewey 1985 Amer J Bot 72:767–776; Wilson 1963 Brittonia 15:303–323]
See Agropyron, Elytrigia, Leymus, Pseudoroegneria for species sometimes treated here. Some species hybridize; hybrids with Hordeum, Leymus, Pseudoroegneria also occur.


E. elymoides (Raf.) Swezey


Stem 1–6.5 dm
Leaf: sheath glabrous to long-hairy, appendages < 1 mm; blade 1–6 mm wide, flat, folded, or rolled
Inflorescence 2.5–15 cm (except awns), breaking apart with age; internodes 3–10 mm; spikelets generally 2 per node
Spikelet 12–20 mm; glumes 35–85 mm, awn-like, base narrow, thick, generally spreading, sometimes with 1–2 short awns at base; lemma awn 30–90 mm, spreading; anthers ± 2 mm
Chromosomes: 2n=28
Ecology: Dry, open areas
Elevation: 600–4200 m.
Bioregional distribution: Klamath Ranges, Cascade Range, Sierra Nevada, San Francisco Bay Area, Transverse Ranges, Peninsular Ranges, Great Basin Floristic Province, Desert
Distribution outside California: to Washington, Great Plains, Texas, n Mexico
Synonyms: Sitanion hystrix (Nutt.) J.G. Sm
Hybrids with E. trachycaulus have been called E. macounii Vasey or (from c SNH, MP), E. saundersii Vasey [ Agropyron s. (Vasey) Hitchc.] Hybrids with E. glaucus have been called E. X hansenii Scribner [ Sitanion h. (Scribner) J.G. Sm.] Hybrids with Pseudoroegneria spicata have been called Agropyron saxicola (Scribner & J.G. Sm.) Piper. (see also E. multisetus ).

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bioregional map for ELYMUS%20elymoides being generated
N.B. The distribution depicted here differs from that given in The Jepson Manual (1993)
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Elymus elymoides
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