|Jepson Flora Project: Jepson Interchange|
|TREATMENT FROM THE JEPSON MANUAL (1993)||
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
AND IS MAINTAINED FOR ARCHIVAL PURPOSES ONLY
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) 1many; 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: 650900 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.
Annual, ± hairy
Stems erect, becoming prostrate
Leaves basal and cauline; collar 0; sheath and blade continuous; basal leaves long, floating when young, becoming dry and non-functional as aerial parts grow; cauline leaf blade flat or inrolled when dry
Inflorescence spike-like, exserted; spikelets 2-ranked
Spikelet laterally compressed; glumes irregularly 25-toothed; florets 440, breaking above glumes and between florets with age; lemma strongly 5-toothed, each tooth 1/31/2+ lemma length, prominent central vein flanked by 2 weaker veins; palea < lemma; anthers white or pinkish, exserted, filaments slender, ribbon-like; stigma 1/31/2 style length, ± sparsely short-hairy
Species in genus: 5 species: CA, n Baja CA
Etymology: (C.R. Orcutt, CA botanist, 18641929)
Reference: [Reeder 1982 Amer J Bot 69:10821095]
Plant generally with 1 main stem, sometimes weakly cespitose, sparsely hairySee the CNPS Inventory for information about endangerment and rarity.
Stem generally erect, sometimes becoming decumbent, 515(25) cm, often branching in upper 210 cm
Leaf: blade 1.52 mm wide
Inflorescence 510 cm, exserted with age; spikelets ± evenly spaced on axis
Spikelet: glumes 36 mm, subequal, 35-toothed, teeth < 1 mm; florets 520; lemma 4.56 mm, acute or with awn-tipped teeth, teeth ± equal, ± 1/2 lemma body length, spreading or slightly recurved; palea slightly < lemma; anthers ± 3 mm
Fruit ± 3 mm, narrowly oblong
Ecology: Vernal pools
Elevation: 2001100 m.
Bioregional distribution: Inner North Coast Ranges (Lake Co), Cascade Range Foothills (Shasta, Tehama cos.).