The supraspecific taxonomy and evolution of the fern genusAzolla (Azollaceae) |
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| Authors: | Richard M K Saunders Keith Fowler |
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| Institution: | (1) School of Biological Sciences, University of Portsmouth, King Henry I Street, PO1 2DY Portsmouth, U.K.;(2) Present address: Department of Botany, University of Hong Kong, Pokfulam Road, Hong Kong |
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| Abstract: | The systematics of the aquatic fern genusAzolla
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 (comprisingA. filiculoides
Lam.,A. rubra
R. Br.,A caroliniana auct. nonWilld.,A. microphylla auct. nonKaulf. andA. mexicana
Presl), subg.Azolla sect.Rhizosperma (Mey.)Mett. (comprisingA. pinnata
R. Br.), and subg.Tetrasporocarpia subg. nov. (comprisingA. nilotica
Decne. exMett.). |
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| Keywords: | Pteridophytes Rhizosperma Tetrasporocarpia water ferns Chromosome number cladistics cytology morphology systematics |
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