Robert W. Freckmann Herbarium


Because of technology changes and personnel changes at UWSP and the Wisconsin State Herbarium, the database of plant species housed at this site was merged with the database from the OLD WisFlora website to create a new Flora of Wisconsin website at Currently we are encouraging all Wisplant viewers to begin using the Flora of Wisconsin website as soon as possible. Wisplants will remain operational through July 13th. After that date, all traffic to Wisplants will be redirected to the Flora of Wisconsin website.

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  Ceratophyllum demersum L. image
Photographer: Dennis W. Woodland           

Botancial Illustration

Kurt Stüber

Paul Skawinski

Paul Skawinski

Paul Skawinski

Robert W. Freckmann
Family Ceratophyllaceae
Ceratophyllum demersum L.
coon's-tail, hornwort
Ceratophyllum: from the Greek keras, "a horn," and phyllon, "leaf," alluding to the stiff and narrow leaf divisions, this is a genus often called hornwort
demersum: living under water, submerged
County distribution map- click for detailed distribution maps.
Detailed Distribution:
Town Range Maps
Google Dot Maps
Status: Native
Plant: perennial, submerged aquatic, evergreen; stems long, trailing; lacks true roots, may anchor in sediment by modified leaves
Flower: tiny, male and female flowers, in leaf axils, on separate plants
Fruit:dry seed with 2 spines at the base and 1 at the top
Leaf:whorled, stiff, 5-12 per node, forks 1-2 times, edges toothed with small spine at tip, spaced whorls closer at branch ends
Habitat: water to >7' deep

More Information Natural Communities Herbarium Specimens
All Ceratophyllum list Google- Images or Text

Flora of North America (off site)
Ceratophyllum apiculatum Cham.
Ceratophyllum demersum L. var. apiculatum (Cham.) Asch.
Ceratophyllum demersum L. var. apiculatum (Cham.) Garcke

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