Jepson Interchange (more information)
Print edition is available from the University of California Press
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This page is based on the 1993 Jepson Manual.
Please see the Jepson eFlora for up-to-date information about California vascular plants. |
| Jepson Flora Project: Jepson Interchange |
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TREATMENT FROM THE JEPSON MANUAL |
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Jepson Interchange (more information) |
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©Copyright 1993 by the Regents of the University of California
Print edition is available from the University of California Press |
| The second edition of The Jepson Manual (2012) is available from the University of California Press | |
| See also the Jepson eFlora, which parallels the Second Edition |
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).[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.
Annual, perennial herb
Stems generally erect
Leaves cauline; sheath glabrous; ligule membranous, acute, entire or irregularly cut; blades flat
Inflorescence panicle-like; branches short, spike-like, ascending to appressed; spikelets 2-ranked, overlapping
Spikelet ± round in outline; glumes ± equal, strongly compressed, wrinkled, 3-veined, winged; axis breaking below glumes, falling as 1 unit; florets 1–2, bisexual; lemma 5-veined, acuminate; palea narrow, < lemma
Species in genus: 2 species: North America, Eur
Etymology: (J. Beckmann, German botanist, 1739–1811)
Reference: [Reeder 1953 Bull Torrey Bot Club 80:187–196]
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Stem 2.5–10 dm
Leaf: ligule 4–8 mm; blades 6–21 cm, 4–10 mm wide
Inflorescence 9–28 cm, narrow, ± dense; branches 0.5–4 cm, ascending to appressed
Spikelet 1.5–3 mm; glumes glabrous to finely scabrous, tip short-pointed; floret 1; lemma 2–3 mm, lanceolate, acuminate; palea < lemma, 2-toothed
Chromosomes: 2n=14
Ecology: Pond margins, streams, marshes
Elevation: < 1500 m.
Bioregional distribution: Northwestern California, Cascade Range, n Sierra Nevada, n Central Coast, San Francisco Bay Area, Modoc Plateau, n East of Sierra Nevada
Distribution outside California: to Alaska, e US
Flowering time: May–Jul
| 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). |
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