Jepson Flora Project: Jepson Interchange    

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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 or mat-like, sometimes from short stolons
Stems spreading to erect
Leaves generally basal; ligule short-hairy; blade ± stiff, pointed
Inflorescence raceme- or panicle-like, head-like, ± dense
Spikelet compressed; glumes ± equal, membranous, generally acuminate, glabrous, 1-veined; axis breaking apart above glumes and between florets; florets 4–20, lower bisexual, upper staminate or sterile; lemma wide, back rounded, generally densely soft-hairy below middle, 3-veined, tip 2-lobed or not, short-awned from tip or not; palea densely hairy below middle; stamens 1 or 3
Species in genus: 5 species: sw US, Mex, South America
Etymology: (Greek: woolly nerve, from lemma, palea hairs)
Reference: [Tateoka 1961 Amer J Bot 48:565–573]


E. pulchellum (Kunth) Tateoka


Perennial, mat-like, with clusters of leaves from short stolon-like stems
Stems spreading to erect, < 1 dm
Leaf: sheath margin short-soft-hairy at collar; blade 2–6 cm, inrolled
Inflorescence ± panicle-like, 1–2.5 cm, 1–1.5 cm wide, short-stalked to subsessile and generally < terminal leaves
Spikelet 6–9 mm; glumes 6–9 mm, tan or purplish, short-awned; lemma 2.5–5 mm, 2-lobed from near middle, awn 2.5–4 mm
Chromosomes: 2n=16
Ecology: Sandy to rocky slopes, flats, desert scrub, woodland
Elevation: 300–1700 m.
Bioregional distribution: Desert
Distribution outside California: to Colorado, Texas, c Mexico
Flowering time: Feb–May
Synonyms: Tridens p. (Kunth) Hitchc

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bioregional map for ERIONEURON%20pulchellum 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 Erioneuron pulchellum
Retrieve dichotomous key for Erioneuron
Overlay Consortium of California Herbaria specimen data by county on this map
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