Ceratophyllum echinatum A. Gray
Common Name: SPINY HORNWORT
Coefficient of Conservatism: 10
Coefficient of Wetness: -5
Wetness Index: OBL
Physiognomy: Nt P-Forb

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).

Locations

Alger County
Allegan County
Baraga County
Calhoun County
Charlevoix County
    Only on Beaver Island
Cheboygan County
Gogebic County
Houghton County
Iron County
Kent County
Keweenaw County
    Only on Isle Royale
Luce County
Ontonagon County
Roscommon County
Schoolcraft County
Washtenaw County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 11, 2017. http://www.michiganflora.net/species.aspx?id=810.