Ceratophyllum echinatum A.Gray
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Authority
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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Family
Ceratophyllaceae
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Scientific Name
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Description
Species Description - Much like no. 1 [Ceratophyllum demersum L.]; lvs more flaccid, the larger ones mostly 3(4) times forked, the ultimate segments commonly narrower, entire or with a few small, very slender teeth; achenes with several unequal marginal spines as well as 2 basal ones, conspicuously tuberculate on the surface; all plumular lvs forked. Quiet water; N.S. and N.B. to B.C., s. to Fla. and trop. Amer.; less often collected than no. 1.