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, perennial herb, submerged aquatic, monoecious
Stem slender, well branched
Leaves whorled, repeatedly forked; divisions thread-like or narrow, ± stiff, minutely serrate
Inflorescence: flowers solitary in axils, sessile
Flower minute; perianth thin, many-parted; stamens 10–20, free; pistil generally 1, ovary sessile, chamber 1, ovule 1, style persistent
Fruit: achene, smooth to spiny. 1 genus.
The only genus
Species in genus: ± 3 species: worldwide
Etymology: (Greek: horn leaf, from stiff leaf divisions)
Cult in pools, aquaria.
| Native |
Stem: branches 5–25 dm
Leaves 5–12 per whorl, 1–2.5 cm, ± prickly-serrate on 1 surface
Fruit ± 5 mm, widely elliptic, smooth to spiny-tubercled
Chromosomes: 2n=24
Ecology: Ponds, ditches, slow streams
Elevation: generally < 2000 m.
Bioregional distribution: California
Distribution outside California: worldwide
Flowering time: Jun–Aug
| 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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