Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California

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



J. Travis Columbus

Annual, perennial herb, generally cespitose
Stem solid, generally glabrous
Leaves generally basal; ligule generally < 1 mm, generally hairy; blade flat to inrolled, upper surface generally ± short-hairy, often ciliate near ligule, hairs long, bulbous-based
Inflorescence generally panicle-like; branches spike-like, 1 per node, persistent or deciduous in fruit; spikelets 2-rowed on 1 side of axis, overlapping
Spikelet sessile or short-stalked, ± cylindric to laterally compressed; glumes generally unequal, generally lanceolate, 1-veined, upper glume firmer than lower; axis (if inflorescence branch persistent) breaking between glumes and lower floret; florets generally 2–3, lower floret bisexual, > upper, upper florets generally vestigial, sterile; lemmas 3-veined, generally 3-awned, awns straight, scabrous; palea ± = lemma
Species in genus: ± 40 species: Am
Etymology: (Claudio (born 1774) and Esteban (born 1776) Boutelou, Spanish botanists, horticulturists)
Reference: [Gould 1979 Ann Missouri Bot Gard 66:348–416]
Many species important for forage.


B. aristidoides (Kunth) Griseb. var. aristidoides


Stem decumbent to erect, 0.5–3.5 dm
Leaf: blade < 7 cm, < 2 mm wide
Inflorescence: branches 4–16, 8–25 mm, appressed to reflexed, deciduous in fruit; branch axis exceeding terminal spikelet node > 5 mm, base densely short-hairy; spikelets 1–4 per branch, generally appressed, falling with branch
Spikelet: upper glume 5–7 mm, glabrous or hairy, acute; florets (1)2; lower floret lemma ± = upper glume, glabrous or hairy, lobes 0, awns 0 or 2, < 1 mm; upper floret base hairy-tufted, lobes generally 0 between awn bases, awns 2–7 mm, generally unequal
Chromosomes: 2n=40
Ecology: Dry, open, sandy to rocky slopes, flats, washes, disturbed sites, scrub, woodland
Elevation: < 1800 m.
Bioregional distribution: e Peninsular Ranges, e&s Mojave Desert, Sonoran Desert
Distribution outside California: to Utah, Texas, s Mexico, S.America
Flowering time: Apr–Sep
Another var. in AZ, NM, n Mex
Horticultural information: STBL.

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bioregional map for BOUTELOUA%20aristidoides%20var.%20aristidoides being generated

Retrieve Jepson Interchange Index to Plant Names entry for Bouteloua aristidoides var. aristidoides
Retrieve dichotomous key for Bouteloua
Overlay Consortium of California Herbaria specimen data by county on this map
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