References
Les, D.H. 1988a. The evolution of achene morphology in Ceratophyllum (Ceratophyllaceae), II. Fruit variation and systematics of the "spiny-margined" group. Systematic Bot. 13: 73-86. Google Scholar
Les, D.H. 1988a. The evolution of achene morphology in Ceratophyllum (Ceratophyllaceae), II. Fruit variation and systematics of the "spiny-margined" group. Systematic Bot. 13: 73-86. Google Scholar