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Key to families | Table of families and genera

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.

 

DANTHONIA OAT GRASS

James P. Smith, Jr. & Kelly W. Allred


Perennial herb, cespitose. Stem: erect. Leaf: generally basal and cauline; sheaths < internodes; ligule short, densely ciliate; blade narrow, flat to folded. Inflorescence: generally raceme-like (occasionally panicle-like or spikelet 1). Spikelet: ± laterally compressed; glumes ± equal, > florets, papery, 1–7-veined; florets 3–8, breaking above glumes and between florets; callus short-hairy; lemma rounded, (5)7–11-veined, tip 2-toothed, awn 0 or generally awned on back below teeth, awn generally bent, flat, coiled below bend, straight, ± cylindric above bend; palea = lemma; anthers 3. Fruit: elliptic.
20 species: warm temperate, tropics, America, Europe, northern Africa. (É. Danthoine, French botanist, agrostologist, 1739–1794) [Darbyshire 2003 FNANM 25:301–306] Danthonia pilosa R. Br. now treated as Rytidosperma. Variation, especially in Danthonia californica, and Danthonia unispicata, needs study. Danthonia purpurea L. f. [Karroochloa purpurea (L. f.) Conert & Türpe], grown at the Botanical Garden at Berkeley, but not naturalized.

Key to Danthonia

1. Lemma awnless ..... [D. decumbens]

1' Lemma awned

2. Upper leaf blades abruptly spreading to reflexed; lower inflorescence branches flexible, ± divergent to reflexed ..... D. californica

2' Upper leaf blades ascending; lower inflorescence branches or stalks stiff, erect

3. Spikelets generally 5–10 per inflorescence; lemma (except awns) 3–6 mm; leaves generally glabrous, not papillate ..... D. intermedia subsp. intermedia

3' Spikelets 1(2–3) per inflorescence; lemma (except awns) 5.5–11 mm; leaves generally densely hairy, hairs papillate at base or leaf surface papillate only ..... D. unispicata

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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].
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