Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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CERATOPHYLLACEAE

HORNWORT FAMILY

Fosiée Tahbaz

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.

CERATOPHYLLUM

HORNWORT

The only genus
Species in genus: ± 3 species: worldwide
Etymology: (Greek: horn leaf, from stiff leaf divisions)
Cult in pools, aquaria.

Native

C. demersum L.


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

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bioregional map for CERATOPHYLLUM%20demersum 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 Ceratophyllum demersum
Retrieve dichotomous key for Ceratophyllum
Overlay Consortium of California Herbaria specimen data by county on this map
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