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Plant Systematics and Evolution

, Volume 184, Issue 3–4, pp 175–193 | Cite as

The supraspecific taxonomy and evolution of the fern genusAzolla (Azollaceae)

  • Richard M. K. Saunders
  • Keith Fowler
Article

Abstract

The systematics of the aquatic fern genusAzollaLam. 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. filiculoidesLam.,A. rubraR. Br.,A caroliniana auct. nonWilld.,A. microphylla auct. nonKaulf. andA. mexicanaPresl), subg.Azolla sect.Rhizosperma (Mey.)Mett. (comprisingA. pinnataR. Br.), and subg.Tetrasporocarpia subg. nov. (comprisingA. niloticaDecne. exMett.).

Key words

Pteridophytes Rhizosperma Tetrasporocarpia water ferns Chromosome number cladistics cytology morphology systematics 

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Copyright information

© Springer-Verlag 1993

Authors and Affiliations

  • Richard M. K. Saunders
    • 1
  • Keith Fowler
    • 1
  1. 1.School of Biological SciencesUniversity of PortsmouthPortsmouthU.K.

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