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
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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.


Perennial, ± tufted
Stems generally erect
Leaf: ligule fringed or short-hairy; blade flat or inrolled
Inflorescence panicle-like, open to dense, or spike-like
Spikelet ± compressed; glumes ± equal, membranous, lower 1-veined, upper 1–3(5)-veined; axis breaking above glumes and between florets; lemma wide, thin, back rounded, veins hairy below middle, 3-veined, tip notched or 2-toothed, generally short-pointed; palea generally < lemma, glabrous or minutely hairy
Species in genus: 18 species: North America
Etymology: (Latin: 3-toothed, from lemma tip)
Reference: [Tateoka 1961 Amer J Bot 48:565–573]


T. muticus (Torr.) Nash


Plant densely tufted
Stem 2–5 dm
Leaf: sheath hairy, especially near collar; ligule short-hairy; blade 3–25 cm, 1–3 mm wide, generally inrolled, ± fine scabrous, sometimes sparsely hairy
Inflorescence 4–20 cm, 3–8 mm wide, narrow; branches short, appressed; spikelets subsessile to short-stalked
Spikelet 8–11 mm, ± cylindric; glumes 5–6 mm, 1-veined; florets 6–8, strongly overlapping, pale to light purple; callus densely hairy; lemma ± 5 mm, veins densely hairy below middle, tip entire to minutely notched; palea keels densely hairy
Chromosomes: 2n=40
Ecology: Dry, rocky, generally limestone soils, creosote-bush scrub, pinyon/juniper woodland
Elevation: 900–2000 m.
Bioregional distribution: East of Sierra Nevada, Desert Mountains
Distribution outside California: to Colorado, Texas, Mexico
Flowering time: Apr–May, Oct–Nov
Horticultural information: DRN, SUN: 1, 2, 3, 7, 8, 9, 10, 11, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24.

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bioregional map for TRIDENS%20muticus 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 Tridens muticus
Retrieve dichotomous key for Tridens
Overlay Consortium of California Herbaria specimen data by county on this map
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