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.



Dieter H. Wilken

Stems erect, 1–6, ± glabrous
Leaves basal and cauline; ligules 2–5 mm, membranous, rounded at tip; blade flat
Inflorescence panicle-like, open
Spikelets generally stalked, ± pendent; glumes subequal, generally > florets, membranous, 5–7-veined, generally glabrous; axis prolonged behind upper floret, vestigial floret at tip; florets 2–3, upper floret > lower, bisexual, breaking above glumes and between florets or not breaking; lemmas hard, glabrous to hairy below awn, awned at or slightly below middle, tip 2-forked, 5–7-veined, awn stiff, bent to straight, slightly to strongly coiled below bend; palea ± < lemma
Species in genus: ± 10–15 species: temp Eur, Asia. Cult for grain, hay
Etymology: (Latin: oats)


A. barbata Link


Stem 3–6 dm
Leaf: blade 2–6 mm wide, glabrous to minutely scabrous (sometimes ciliate)
Spikelet: glumes 18–30 mm, 5–7-veined; lemmas 12–18 mm, generally soft-hairy below awn, forks at tip 2–6 mm, bristly, awn 20–40 mm, bent, twisted below bend
Chromosomes: 2n=28
Ecology: Disturbed sites
Elevation: 40–1200 m.
Bioregional distribution: California Floristic Province, Modoc Plateau, Mojave Desert
Distribution outside California: reported elsewhere in US; native to s Europe
Flowering time: Mar–Jun

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bioregional map for AVENA%20barbata being generated
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 Avena barbata
Retrieve dichotomous key for Avena
Overlay Consortium of California Herbaria specimen data by county on this map
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