| Abstrakt: |
The systematics of the aquatic fern genus Azolla Lam. is revised at the supraspecific level. Published morphological data are reviewed, and cytological and cladistic analyses of the genus conducted, enabling a discussion of the putative evolutionary trends in the genus, and a revision of the current taxonomy. A phylogenetically more acceptable subgeneric and sectional classification is proposed, viz. subg. Azolla sect. Azolla (comprising A. filiculoides Lam., A. rubra R. Br., A caroliniana auct. non Willd., A. microphylla auct. non Kaulf. and A. mexicana Presl), subg. Azolla sect. Rhizosperma ( Mey.) Mett. (comprising A. pinnata R. Br.), and subg. Tetrasporocarpia subg. nov. (comprising A. nilotica Decne. ex Mett.). [ABSTRACT FROM AUTHOR] |
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