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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  • Up-to-date information about California vascular plants is available from the Jepson eFlora.

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.

ORCUTTIA

John R. Reeder

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 2–5-toothed; florets 4–40, breaking above glumes and between florets with age; lemma strongly 5-toothed, each tooth 1/3–1/2+ lemma length, prominent central vein flanked by 2 weaker veins; palea < lemma; anthers white or pinkish, exserted, filaments slender, ribbon-like; stigma 1/3–1/2 style length, ± sparsely short-hairy
Species in genus: 5 species: CA, n Baja CA
Etymology: (C.R. Orcutt, CA botanist, 1864–1929)
Reference: [Reeder 1982 Amer J Bot 69:1082–1095]

Native

O. pilosa Hoover

HAIRY ORCUTT GRASS

Plant cespitose, generally densely hairy
Stem decumbent to erect, 5–20(35) cm
Leaf: sheath and blade generally separated by line when dry; blade 3–5(8) mm wide
Inflorescence < 10 cm, exserted with age; spikelets crowded at tip, ± overlapping below
Spikelet: glumes ± 3 mm, irregularly 3-toothed; florets 10–40; lemma 4–5 mm, acute or with awn-tipped teeth, teeth ± equal, 1/3–1/2 lemma body length; anthers 2.5–3 mm
Fruit ± 2 mm, elliptic
Chromosomes: 2n=30
Ecology: Vernal pools
Elevation: < 200 m.
Bioregional distribution: Great Central Valley (Madera, Merced, Stanislaus, Tehama cos.).
See the CNPS Inventory for information about endangerment and rarity.
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