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| Jepson eFlora
Key to families | Table of families and genera This text currently parallels The Jepson Manual: Vascular Plants of California, Second Edition that is now available at the University of California Press. Text appearing in blue on this page will not appear in the printed book; it will be displayed only on the Web. Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link. |
Annual.
Stem: erect, 1–6, ± glabrous.
Leaf: basal and cauline; ligule 2–5 mm, membranous, rounded at tip; blade flat.
Inflorescence: panicle-like, open.
Spikelet: 15–50 mm, laterally compressed, generally stalked, ± pendent; glumes unequal or ± equal, generally > florets, membranous, 3–11-veined, generally glabrous; axis occasionally prolonged behind upper floret, vestigial floret at tip; florets (1)2–6(8), 2+ bisexual, reduced florets distal to proximal ones, breaking above glumes and between florets or not; lemma hard, glabrous to hairy below awn, awned at or slightly below middle, 5–9-veined, tip 2- forked, forks ± tooth-like, awn stiff, generally bent, slightly to often strongly coiled below bend; palea ± < lemma; anthers 3.
Fruit: cylindric, longitudinally grooved, pubescent.
29 species: temperate Eur, n Africa, c Asia. (Latin: oats) [Baum 2007 FNANM 24:734–739] Cult for grain, hay. CA records of Avena strigosa Schreb. are based on misidentifications of Avena barbata. CA records of Avena occidentalis Durieu, are based on a misidentification of Avena fatua.
Unabridged references: [Baum 1977 Biosystematics Res Inst Monogr 14]
1. Callus glabrous; florets remaining attached at maturity; lemma glabrous or nearly so, awn of lower floret generally 0(15) mm ..... A. sativa
1' Callus bearded; florets falling singly or as a unit at maturity; lemma densely strigose or soft hairy, especially below, awned
2. Lemma bristle-tipped, teeth 2–6 mm ..... A. barbata
2' Lemma tip ragged or 2-forked, teeth <= 1.5 mm
3. Florets falling separately from glumes; awn of lowest floret 25–40 mm; leaf margin glabrous ..... A. fatua
3' Florets falling from glumes as a unit; awn of lowest floret 35–90 mm; leaf margin sparsely hairy ..... A. sterilis
Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
We encourage links to these pages, but the content may not be downloaded for reposting, repackaging, redistributing, or sale in any form, without written permission from The Jepson Herbarium.