PHYLOGENETICS OF THE 'TIGER-FLOWER' GROUP (TIGRIDIEAE: IRIDACEAE): MOLECULAR AND MORPHOLOGICAL EVIDENCE

摘要

The phylogenetic relationships among 23 species of the tribe Tigridieae (Iridaceae) were inferred using morphological data and nucleotide sequences from nuclear ITS and three intergenic spacers of the cpDNA: psbA-tmH, trnT-trnL, and tmL-trnF. Althoughall data sets supported a monophyletic Mexican-Guatemalan Tigridiinae including two taxa usually placed in Cipurinae (Cardiostigma lon-gispatha and Nemastylis convoluta), neither morphology, cpDNA, nor ITS resolved phylogenetic relationships within thislineage. A graphical tree of trees analysis showed the cladograms derived from morphology to be the most topologically distinct within the set of all trees examined and to be the set with most divergent trees. Finally, cladistic analysis of the combineddata sets supported the recurrent dispersal of Cipurinae from South to North America and a South American origin of the Mexican-Guatemalan subtribe Tigridiinae.