|Jepson Flora Project: Jepson Interchange|
|TREATMENT FROM THE JEPSON MANUAL (1993)||
previous taxon |
Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
AND IS MAINTAINED FOR ARCHIVAL PURPOSES ONLY
Perennial, floating aquatics, small, clonal, in dense populations; new plants produced in budding pouch at base or along margins; may overwinter on bottom as dense, rootless, starch-filled daughter plant (winter bud); roots 0many
Plant body 0.410 mm, flat and tongue-shaped to spheric
Flower 1, rarely seen, minute, appearing like 23 unisexual flowers, often sheathed by minute membrane; perianth 0; stamens 12; pistil 1, simple, maturing before stamens
Fruit achene-like, sometimes winged
Seeds 13, smooth or ribbed. Spp. best separated by chemistry and fruit; clones vary; magnification, backlighting generally needed to identify vegetative plants
Genera in family: 4 genera, 34 species: worldwide; ornamental in pools, aquaria
Reference: [Landolt 1986 Veröff Geobot Inst ETH Stiftung Rübel Zürich 71]
Horticultural information: TRY.
Plants generally in clusters of 2many; root generally 1, generally 26 mm, sheath near base generally not winged
Plant body generally 25 mm, flat, generally widely elliptic to oblong, pale to dark green, often ± red; veins 15 (visible in backlight); winter buds generally 0
Flowers in 2 lateral pouches, sheathed by minute membrane
Fruit generally unwinged
Seed ribbed, generally smooth between ribs
Species in genus: 13 species: worldwide
Etymology: (Greek: lake or swamp)
Root often 0
Plant body 610 mm, lanceolate to oblong, transparent green, on a long, tapered stalk, connected in branched chains of 830; base and tip symmetric; surfaces smooth
Ecology: Meadows, mtn streams
Elevation: < 3000 m.
Bioregional distribution: Cascade Range, Sierra Nevada, South Coast?, San Bernardino Mountains, Great Basin Floristic Province, Mojave Desert?
Distribution outside California: nearly worldwide
Flowering time: Aug
Generally forming dense, tangled masses below water surface.