Ceratophyllum echinatum, commonly called spineless hornwort, is an aquatic perennial plant of the genus Ceratophyllum. It can be found in ponds and lakes. It is principally an eastern North American species and the only species of its genus endemic to North America.
1 Description 2 Distribution 3 Economic value 4 Threatened and endangered status 5 Origin of the name 6 References
Description Ceratophyllum echinatum is an aquatic herb. The spineless hornwort usually does not have any roots with stems that are freely branching (0.3 – 4.0 m long). The leaves are submerged and they are usually in whorls of 5 to 12. Its flowers do not have any petals but have sepals (3 to 15) that are sometimes mistaken for petals. The flower is tiny, could be male or female, and contains about 12 to 16 stamens. It blooms from February to July. The fruits have dry seeds with a lot of spines and a rough surface. Distribution Ceratophyllum echinatum can be found in the United States and some parts of Canada. Economic value It is often used in aquariums because its appearance, its high oxygen production, and its ability to minimize the blue-green algae growth. Threatened and endangered status Several states list this species as threatened or endangered:
Maine: prickly hornwort - special concern Maryland : prickly hornwort - endangered New Jersey: spiny coontail - endangered New York: prickly hornwort - threatened Tennessee: pricky hornwort - special concern
Origin of the name Ceratophyllum comes from the Greek keras, "a horn" and phyllon, "leaf", which is alluding to the stiff and narrow leaf divisions. The specific epithet echinatum comes from echinus which means "sea urchin or hegdehog"; it is therefore called "spiny". References
Wikispecies has information related to Ceratophyllum echinatum
^ "Ceratophyllum echinatum". from Alabama Plant atlas. ^ "Ceratophyllum echinatum". From Flora of North America. ^ "Species Information". Electronic Atlas of the Plants of British Columbia. ^ "Ceratophyllum echinatum A.Gray". From Robert W. Freckmann Herbarium. ^ "Distribution Map of the Spineless Hornwort". From the USDA. ^ "Threatened and Endangered Information". From the USDA. ^ "Origin of the Name". From the Robert W. Freckmann Herbarium.
Wd: Q5063798 EoL: 488403 EPPO: CEYEC FNA: 233500338 GBIF: 5333331 iNaturalist: 160354 IPNI: 52526-2 ITIS: 501366 NCBI: 251681 PLANTS: CEEC2 Tropicos: 70