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

  • Up-to-date information about California vascular plants is available from the Jepson eFlora.



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

Stem erect, generally tufted
Leaf: sheath sometimes appendaged; ligule membranous; blade flat or rolled
Inflorescence spike-like, dense; axis not breaking apart in fruit; spikelets 2-ranked, strongly overlapping, 1 per node, generally spreading
Spikelet: glumes generally ± equal, = or < lower floret, lanceolate, keeled, acute to short-awned; axis breaking above glumes and between florets; lemma firm, acute to awn-tipped; anthers 2–5 mm
Species in genus: 12 species: Medit, e Eur, c Asia
Etymology: (Greek: ancient name for wild wheat)
Reference: [Barkworth & Dewey 1985 Amer J Bot 72:767–776]
See also Elymus, Elytrigia, Pascopyrum, Pseudoroegneria for species sometimes treated here.


A. desertorum (Fisch.) Schult.


Stem 2.5–10 dm
Leaf: sheath, blade generally glabrous, sometimes soft-hairy or scabrous
Inflorescence 3–10 cm; internodes 1–3 mm; spikelets spreading to ascending
Spikelet 7–11 mm; glumes < lower floret, translucent margin ± 0.4 mm wide, generally 3-veined; florets 3–8; lemma 5–9 mm, generally 5-veined, awn < 3.5 mm
Chromosomes: 2n=28
Ecology: Disturbed areas, roadsides
Elevation: 600–1500 m.
Bioregional distribution: Cascade Range Foothills, n High Sierra Nevada, Great Basin Floristic Province
Distribution outside California: to Great Plains; native to eastern Europe
Plants with inflorescence internodes < 1 mm, spikelets spreading are called A. cristatum (L.) Gaertn. Plants with spikelets appressed, lemma awn < 1 mm, are called A. fragile Roth
Synonyms: A. sibiricum Willd
All forms (and hybrids) are planted for erosion control.

previous taxon | next taxon
bioregional map for AGROPYRON%20desertorum being generated

Retrieve Jepson Interchange Index to Plant Names entry for Agropyron desertorum
Retrieve dichotomous key for Agropyron
Overlay Consortium of California Herbaria specimen data by county on this map
Show other taxa with the same California distribution | Read about bioregions | Get lists of plants in a bioregion
Return to the Jepson Interchange main page
Return to treatment index page

University & Jepson Herbaria Home Page |
General Information | University Herbarium | Jepson Herbarium |
Visiting the Herbaria | On-line Resources | Research |
Education | Related Sites
Copyright © by the Regents of the University of California