Species of aquatic plant
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Ceratophyllum echinatum, known as prickly hornwort, spiny hornwort, or spiny coontail, is an aquatic, perennial plant found in North America. Its name comes from fruits, which have a warty surface and long spines. Spiny hornwort can be found in ponds and lakes, principally in eastern North America. It is the only species of its genus endemic to North America.
"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 hedgehog. 
Description.
"Ceratophyllum echinatum" is an aquatic herb. It does not typically have any roots with stems that are freely branching and up to in length. 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, may be male or female, and contains about 12 to 16 stamens. It blooms from February to July. The fruits have dry seeds with spines and a rough surface.
Threatened and endangered status.
Several states list this species as special concern (Maine, Tennessee), threatened (New York), or endangered (Maryland, New Jersey).
References.
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