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.

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.

PIPTATHERUM

Mary E. Barkworth

Perennial, cespitose
Stem erect, unbranched
Leaf: ligule membranous, generally truncate; blade flat to inrolled, often tapered
Spikelet: glumes ± equal, obtuse to acute, veins evident; axis breaking above glumes; floret 1, generally ± compressed; callus blunt; lemma margins widely separated with age, awn generally readily deciduous; palea ± = lemma, texture like lemma
Species in genus: 30 species: arid temp, subtropical Eurasia, Africa
Etymology: (Greek: falling awn)
Segregated from Oryzopsis.

Native

P. micranthum (Trin. & Rupr.) Barkworth

SMALL-FLOWERED RICEGRASS


Stem 3–6.5 dm
Leaf: basal ligule 0.4–1.5 mm
Inflorescence 8–13 cm; lowest branches becoming reflexed
Spikelet: glumes 2.5–3.5 mm; floret 1.5–2.5 mm; lemma generally glabrous, sometimes sparsely but evenly short-hairy, awn 4–8 mm, weakly bent
Chromosomes: 2n=22
Ecology: Gravel benches, rocky slopes, creek banks
Elevation: 700–2950 m.
Bioregional distribution: White and Inyo Mountains, Desert Mountains
Distribution outside California: to British Columbia, Rocky Mtns
Flowering time: Jun–Sep
Synonyms: Oryzopsis m. (Trin. & Rupr.) Thurb
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for PIPTATHERUM%20micranthum 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 Piptatherum micranthum
Retrieve dichotomous key for Piptatherum
Retrieve multiple-entry key (MEKA) for Piptatherum
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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