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    THIS PAGE IS NO LONGER UPDATED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.

PASPALUM

Robert Webster

Perennial in CA, generally from rhizomes or stolons
Stems decumbent to erect; internode solid to hollow inside
Leaves basal and cauline; sheath glabrous or hairy; ligule generally membranous
Inflorescence panicle-like; axis generally glabrous; 1° branches raceme- to spike-like, spreading to appressed; spikelets many, 1–2 per node, generally short-stalked, on one side of axis
Spikelet falling as 1 unit, compressed, generally green; glumes 1–2, lower glume minute or 0, upper ± = spikelet; florets 2, lower floret generally sterile, palea vestigial or 0, upper floret fertile, lemma firm, thick, sometimes hard, back facing inflorescence axis, smooth or striate, margin inrolled, tip blunt
Species in genus: ± 300 species: tropical, warm temp worldwide
Etymology: (Greek: ancient name)
Reference: [Gould 1975 The Grasses of Texas pp. 500–527, Texas A&M Press]

Introduced

P. urvillei Steud.

Perennial from short rhizomes
Stem erect, 8–20 dm; nodes 3–6
Leaf: sheath 10–30 cm, glabrous to hairy; ligule 2–9 mm; blade 25–60 cm, 4–25 mm wide, upper surface glabrous
Inflorescence: main axis 12–30 cm; 1° branches 12–20, 7–14 cm; spikelets many, 2 per node, stalk ± 1–1.5 mm
Spikelet ± 1.5–3 mm, ± 1–1.5 mm wide, elliptic, green; lower glume 0; lower floret lemma 3–5-veined, tip acute; upper floret slightly < lower floret
Chromosomes: 2n=40
Ecology: Moist places, fields
Elevation: < 100 m.
Bioregional distribution: Sacramento Valley, South Coast, expected elsewhere
Distribution outside California: native to S.America

previous taxon | next taxon
bioregional map for PASPALUM%20urvillei being generated
 


Retrieve Jepson Interchange Index to Plant Names entry for Paspalum urvillei
Retrieve dichotomous key for Paspalum
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