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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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.

DANTHONIA

OATGRASS

Kelly W. Allred

Perennial, cespitose
Stems erect
Leaves generally basal and cauline; sheaths < internodes; ligule short, densely ciliate; blades narrow, flat to folded
Inflorescence generally raceme-like (sometimes panicle-like or spikelet 1)
Spikelets ± laterally compressed; glumes ± equal, > florets, papery, 1–5-veined; florets 3–8, breaking above glumes and between florets; callus short-hairy; lemma rounded, 7–9-veined, tip 2-toothed, awned on back below teeth; awn generally bent, flat, coiled below bend, straight, ± cylindric above bend, palea = lemma
Fruit elliptic
Species in genus: 20 species: warm temp, tropical, Am, Eur, s Africa
Etymology: (E. Danthoine, France, early 19th century)
Variation, especially in D. californica, D. unispicata , complex, needs critical study.

Introduced

D. pilosa R. Br.


Stem 3–6 dm
Leaves basal and cauline, densely hairy, papillate at base; upper blades 2–4 cm, generally flat, ascending
Inflorescence 3–10 cm, narrow, ± compact; spikelets 6–18, stalk ascending, puberulent
Spikelet: glumes 10–14 mm; florets 4–8; callus ± 1 mm, sharp, hairy; lemma 5–6 mm, teeth 4–6 mm, awn 8–12 mm
Chromosomes: 2n=24,48
Ecology: Disturbed, open sites, meadows, coniferous forest
Elevation: < 800 m.
Bioregional distribution: North Coast, Klamath Ranges, Outer North Coast Ranges, Central Coast, San Francisco Bay Area
Distribution outside California: native to Australia

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bioregional map for DANTHONIA%20pilosa being generated
 
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Retrieve Jepson Interchange Index to Plant Names entry for Danthonia pilosa
Retrieve dichotomous key for Danthonia
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