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 |
Perennial from slender, creeping rhizome, glabrous, aquatic, submersed, monoecious or dioecious
Stem thread-like, weak
Leaves alternate below to ± whorled and linear above; sheath fused to blade or free, stipule-like
Staminate inflorescence generally below pistillate inflorescence, axillary; flowers 1–3
Pistillate inflorescence terminal, short-stalked; flowers 1–9, sessile, subtended by cup-like bract
Staminate flower: perianth parts 0 or 3 and scale-like; stamens 1–3, filaments free or fused; anther 1–2-chambered
Pistillate flower: perianth parts 0; ovary superior, chamber 1, ovule 1, style 1, simple or 3-lobed
Fruit: achene or nutlet
Genera in family: 4 genera; 9–10 species: ± worldwide
Recent taxonomic note: Recently treated in Potamogetonaceae [Angiosperm Phylogeny Group 1998 Ann Missouri Bot Gard 85:531–553].
Perennial, monoecious
Stem generally few-branched
Leaves ± opposite, clustered and ± whorled at upper nodes, stipuled
Staminate flower: stamen 1, filament slender, anther 2-chambered
Pistillate flower: style short, stigma peltate
Fruit: nutlet, stalked, compressed, tip beaked; back curved, ridged, toothed; front ± straight
Species in genus: 1–2 species: ± worldwide
Etymology: (Gian G. Zannichelli, Venetian botanist, 1662–1729)
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Stem 3–10 dm
Leaf 2–10 cm; blade < 1 mm wide, tip acute
Fruit 2–4 mm; beak 1–1.5 mm, flask-shaped
Chromosomes: 2n=12,24,28,32,36
Ecology: Streams, ponds, ditches, lakes
Elevation: < 2200 m.
Bioregional distribution: California
Distribution outside California: ± worldwide
Flowering time: Mar–Nov
| 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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