Jepson Flora Project: Jepson Interchange    

 
link to manual TREATMENT FROM THE JEPSON MANUAL (1993) previous taxon | next taxon
Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit the Jepson eFlora.

POACEAE

GRASS FAMILY

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.

ELYTRIGIA

James K. Jarvie and Mary E. Barkworth

Perennial, generally from rhizomes
Stems erect, sometimes tufted
Leaf: sheath appendaged; ligule membranous; blade flat or rolled
Inflorescence spike-like; axis generally not breaking apart in fruit; spikelets 2-ranked, strongly overlapping, ± appressed to axis, 1 per node
Spikelet: glumes thick, midvein generally prominent and scabrous at least above middle, tip truncate, obtuse, acute or short-awned; axis breaking above glumes and between florets; lemma generally awnless
Species in genus: 25 species: Medit Eur, Asia
Etymology: (Greek: from combination of Elymus and Triticum )
Reference: [Jarvie 1990 PhD dissertation UT State Univ]
Some species cultivated for forage, erosion control; some serious weeds. See Agropyron, Elymus, Pseudoroegneria.

Introduced

E. repens (L.) Nevski

QUACKGRASS


Stem 5–10 dm
Leaf: sheath generally glabrous or lowermost soft-hairy; blade 2–14 mm wide, veins of 2 kinds, some faint, others strongly ribbed, widely spaced
Inflorescence 8–20 cm
Spikelets 9–16 mm; florets 3–8; glumes generally with awn 0.5–4 mm, otherwise acute; lemmas 6–12 mm, tapering to point or awn 0.5–10 mm; anthers 4–5.5 mm
Chromosomes: 2n=42
Ecology: Weed in disturbed areas, cultivated fields
Elevation: < 1800 m.
Bioregional distribution: California Floristic Province, Great Basin Floristic Province
Distribution outside California: to e US; native to Eurasia
Synonyms: Agropyron r. (L.) P. Beauv
Weedy.

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bioregional map for ELYTRIGIA%20repens 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 Elytrigia repens
Retrieve dichotomous key for Elytrigia
Overlay Consortium of California Herbaria specimen data by county on this map
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