|Jepson Flora Project: Jepson Interchange|
|TREATMENT FROM THE JEPSON MANUAL (1993)||
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
AND IS MAINTAINED FOR ARCHIVAL PURPOSES ONLY
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 1020, 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.
Stem: branches 525 dm
Leaves 512 per whorl, 12.5 cm, ± prickly-serrate on 1 surface
Fruit ± 5 mm, widely elliptic, smooth to spiny-tubercled
Ecology: Ponds, ditches, slow streams
Elevation: generally < 2000 m.
Bioregional distribution: California
Distribution outside California: worldwide
Flowering time: JunAug