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.

DESMAZERIA

Dieter H. Wilken

Annual
Stems prostrate to erect, solitary to clumped
Leaves basal and cauline; sheath open; appendages 0; ligule membranous, toothed at tip; blade flat to inrolled
Inflorescence raceme- or panicle-like
Spikelets subsessile to short-stalked; florets 5–25, bisexual, breaking above glumes and between florets; glumes equal to subequal, lower lanceolate, 1–3-veined, upper ± elliptic, 3-veined; lemma firmly membranous, acute to obtuse, 1–5-veined; palea < lemma
Species in genus: 3 species: Eur
Etymology: (J.B. Desmazieres, French botanist)
Reference: [see discussion in Clapham, Tutin, & Warburg 1952 Fl Brit Isles 1434]

Introduced

D. rigida (L.) Tutin


Stem generally erect, 1–3 dm, glabrous
Leaf: blade 2–25 cm, 1–3 mm wide, flat, glabrous
Inflorescence panicle-like, ovoid, 4–8 cm; branches and pedicels rigid, 3-angled; branches widely spreading
Spikelets 5–7 mm, 2–5 on lower branches, lowest in axil; florets 5–12; glumes and lemmas glabrous; glumes 1–2.5 mm; lemmas spreading, 2–3 mm, translucent at acute to abruptly soft-pointed tip
Chromosomes: 2n=14
Ecology: Open, often sandy sites
Elevation: < 700 m.
Bioregional distribution: s North Coast, Central Coast, San Francisco Bay Area, South Coast, s Channel Islands (Santa Catalina Island)
Distribution outside California: to America; native to s&w Europe
Synonyms: Scleropoa r. (L.) Griseb

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bioregional map for DESMAZERIA%20rigida being generated
 
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Retrieve Jepson Interchange Index to Plant Names entry for Desmazeria rigida
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