Ceratophyllum echinatum prickly hornwort Ceratophyllaceae CEEC; R (DeCandido 2001);

  

Ceratophyllum echinatum.wisplants.uwsp.edu.Freckmann Herbarium, University of Wisconsin-Stevens Point.Paul Shawinski

Ceratophyllum echinatum.© Paul Shawinski 2010.Robert W. Freckmann Herbarium, University of Wisconsin-Stevens Point.wisplants.uwsp.edu (Accessed 5/2014).

Ceratophyllum echinatum is a submersed, rootless aquatic perennial herb, stems thin, long, branched, branches often modified into root-like rhizoids. 

Leaves whorled, forked 3-4 times, ultimate leaf segments with fewer, or no teeth. 

Flowers inconspicuous, sexes separate, axillary, males above female, surrounded by 8-10 bracts (sepals) fused at base, 0.1-0.2 cm long .. 

Fruit with warty surface and several unequal spines in addition to the basal ones. 

Wetland status: OBL. 

Frequency in NYC: Very infrequent 

Origin: Native. 

Habitat: Still, cool, clear, open water of ponds. 

Notes: Much less common overall than C. demersum (Flora of North America 1993).