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, aquatic, freshwater or marine, bisexual, monoecious, or dioecious
Leaves basal or cauline, alternate, opposite, or whorled, generally ± sheathing at base, glabrous
Inflorescence: cyme; flowers 1–few, subtended by ± sheathing, entire or lobed bract; staminate flowers sometimes deciduous, free-floating
Flower radial; perianth tube 0 or much elongated, peduncle-like in flower; sepals (0)3, green; petals (0)3, colored or white; stamens (1)3–many, generally in 1+ series; ovary inferior, chamber 1, placentas parietal or basal, ovules 1–many; style lobes generally 3, linear, lobed or notched
Fruit: achene or berry-like and dehiscing irregularly, linear to spheric, submersed
Genera in family: ± 17 genera, ± 130 species: worldwide; some cultivated for aquaria, others noxious weeds.
Species in genus: 1 sp
Etymology: (Greek: growing in water)
| Introduced |
Perennial, rooting at nodes, submersed, dioecious
Stems: horizontal, tuber-like; erect stems elongate, much-branched
Leaves whorled, generally 4–8 per whorl, sessile, 1–2 cm, 1.5–2 mm wide, oblong, margin clearly, sharply toothed, midrib ± keeled below, rough, with tooth-like, conic bumps, tip generally sharp-pointed
Staminate inflorescence: flower 1, bract at base of elongated perianth tube, spheric
Pistillate inflorescence: flower 1, bract at base of elongated perianth tube, ± cylindric
Staminate flower deciduous, free-floating; perianth parts 6 in 2 whorls, 3–5 mm; stamens 3
Pistillate flower persistent, floating; perianth parts 6 in 2 whorls, 3–5 mm; stigmas 3
Fruit 5–6 mm, ± fusiform
Ecology: Ditches, canals, ponds, reservoirs, lakes
Elevation: < 200 m.
Bioregional distribution: Inner North Coast Ranges, n&c Sierra Nevada Foothills, Sacramento Valley, South Coast, Desert
Distribution outside California: to s US, C.America.; native to Eurasia
Weedy.
| 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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