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

    THIS PAGE IS NO LONGER UPDATED
    AND IS MAINTAINED FOR ARCHIVAL PURPOSES ONLY
  • 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.

ARISTIDA

THREE-AWN

Kelly W. Allred

Annual, perennial herb, cespitose
Stem ascending to erect
Leaves basal and cauline; basal often tufted; ligule hairy; blades flat or inrolled
Inflorescence raceme-like or panicle-like; branches spike-like
Spikelet: glumes narrowly lanceolate, thin, 1-veined, awn generally 0; floret 1, breaking above glumes; lemma ± fusiform, hard when mature, 3-veined, tip beak-like or not, awned at tip, awns 3, equal or unequal; palea < lemma, enclosed by lemma, transparent
Fruit narrowly fusiform
Species in genus: ± 300 species: worldwide, arid warm temp. Some species noxious
Etymology: (Latin: awn)
Reference: [Allred 1992 Great Basin Nat 52:41–52]

Native

A. ternipes Cav. var. hamulosa (Henrard) Trent

HOOK THREE-AWN

Perennial, sometimes bushy
Stems few, prostrate to erect, 25–80 cm
Leaf: blade 5–40 cm, flat to inrolled, base sparsely long-hairy
Inflorescence 15–40 cm, open; primary branches spreading
Spikelet: glumes ± equal, 9–15 mm; lemma 10–15 mm, generally straight at tip, awns equal to unequal, central awn 10–25 mm, lateral 6–23 mm
Chromosomes: 2n=44
Ecology: Dry hills and slopes
Elevation: 100–1350 m.
Bioregional distribution: Great Central Valley, South Coast, Transverse Ranges, Peninsular Ranges, Mojave Desert
Distribution outside California: to Texas, C.America
Flowering time: May–Nov
Synonyms: A. h. Henrard
Horticultural information: DRN, SUN: 2, 3, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24; also STBL.

previous taxon | next taxon
bioregional map for ARISTIDA%20ternipes%20var.%20hamulosa being generated
 


Retrieve Jepson Interchange Index to Plant Names entry for Aristida ternipes var. hamulosa
Retrieve dichotomous key for Aristida
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
Return to the Jepson Interchange main page
Return to treatment index page
Glossary


University & Jepson Herbaria Home Page |
General Information | University Herbarium | Jepson Herbarium |
Visiting the Herbaria | On-line Resources | Research |
Education | Related Sites
Copyright © by the Regents of the University of California