Coefficient of Conservatism:
Coefficient of Wetness:
A species most often of acid, softwater lakes and ponds, in contrast to the more neutral or hardwater habitats of C. demersum.
Ceratophyllum echinatum typically has very delicate and flaccid foliage, in this respect suggestive of two other species characteristic of softwater lakes, Myriophyllum farwellii and Utricularia geminiscapa. The lower segments of the leaves are sometimes slightly inflated, and the teeth of the ultimate segments are absent or sparse and inconspicuous, consisting almost solely of a pale spinule with little or no expanded green base (but see remarks under C. demersum, which may have similar leaves). It is necessary to search very carefully for leaves that are forked 3 times (thus with 8 ultimate segments).