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
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Robert F. Thorne

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)


Z. palustris L.

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

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bioregional map for ZANNICHELLIA%20palustris being generated
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).

Retrieve Jepson Interchange Index to Plant Names entry for Zannichellia palustris
Retrieve dichotomous key for Zannichellia
Overlay Consortium of California Herbaria specimen data by county on this map
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