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
Habitat: Still, cool, clear, open water of ponds.
Notes: Much less common overall than C. demersum (Flora of North America 1993).