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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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.

HOLCUS

VELVET GRASS

Dieter H. Wilken

Perennial, cespitose or from rhizomes, glabrous to velvety soft-hairy
Leaves generally basal; ligule membranous, truncate, puberulent; blade flat
Inflorescence panicle-like, ± congested
Spikelets laterally compressed, breaking below glumes, falling as 1 unit; glumes ± subequal, lower 1-veined, upper 3-veined; florets generally 2, lower floret bisexual, upper staminate or sterile; callus hairy; lemmas ± 2 mm, shiny, membranous, faintly 3–5-veined, lemma of lower floret awnless, lemma of upper floret awned near 2-lobed tip; palea ± = lemma
Species in genus: ± 8 species: temp Eurasia, Africa
Etymology: (Latin: a grass)

Introduced

H. lanatus L.

COMMON VELVET GRASS


Stems clumped, ascending to erect, 6–20 dm; nodes and internodes soft-hairy
Leaf: ligule 1–3 mm; blade 5–18 cm, 4–9 mm wide
Inflorescence 7–15 cm
Spikelet: glumes 3–6 mm, purplish, short-hairy on back, keel long-hairy; lemmas 3–4 mm, awn twisted to recurved, ± 1 mm
Chromosomes: 2n=14
Ecology: Moist sites, roadbanks, cultivated fields, meadows
Elevation: 100–2300 m.
Bioregional distribution: California Floristic Province, Great Basin Floristic Province, Mojave Desert
Distribution outside California: to Alaska, Canada, widespread US, S.America; native to Europe
Cult for forage, hay.

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bioregional map for HOLCUS%20lanatus being generated
 
N.B. The distribution depicted here differs from that given in The Jepson Manual (1993)
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 Holcus lanatus
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Overlay Consortium of California Herbaria specimen data by county on this map
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