| TREATMENT FROM THE JEPSON MANUAL (1993) |
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Jepson Interchange (more information) |
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©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit the Jepson eFlora. |
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 10–20, 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.
| Native |
Stem: branches 5–25 dm
Leaves 5–12 per whorl, 1–2.5 cm, ± prickly-serrate on 1 surface
Fruit ± 5 mm, widely elliptic, smooth to spiny-tubercled
Chromosomes: 2n=24
Ecology: Ponds, ditches, slow streams
Elevation: generally < 2000 m.
Bioregional distribution: California
Distribution outside California: worldwide
Flowering time: Jun–Aug