Jepson Flora Project: Jepson Interchange    

link to manual TREATMENT FROM THE JEPSON MANUAL (1993) previous taxon | next taxon
Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit the Jepson eFlora.



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.


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]


O. pilosa Hoover


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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bioregional map for ORCUTTIA%20pilosa being generated
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Orcuttia pilosa
Retrieve dichotomous key for Orcuttia
Retrieve multiple-entry key (MEKA) for Orcuttia
Overlay Consortium of California Herbaria specimen data by county on this map
Show other taxa with the same California distribution | Read about bioregions | Get lists of plants in a bioregion
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