References
Les, D.H. 1986. The evolution of achene morphology in Ceratophyllum (Ceratophyllaceae), I. Fruit-spine variation and relationships of C. demersum, C. submersum, and C. apiculatum. Systematic Bot. 11: 549-558. Google Scholar
Les, D.H. 1986. The evolution of achene morphology in Ceratophyllum (Ceratophyllaceae), I. Fruit-spine variation and relationships of C. demersum, C. submersum, and C. apiculatum. Systematic Bot. 11: 549-558. Google Scholar