Systematics Section / ASPT
Karst, L. , Wilson, C. .
Sisyrinchium (Iridaceae): Phylogeny and Biogeography.
SISYRINCHIUM is a large Western Hemisphere genus of approximately 150 species. Datasets include the cpDNA trnK intron (including the matK gene), and the nrDNA ITS regions for 60 Sisyrinchium taxa and outgroups (Olsynium, Solenomelus, Orthrosanthus, Tigridia and Cypella, members of the New World Iridaceae tribes, Sisyrinchieae and Tigridieae). Bayesian analyses produce trees with strong support. We find eight clades and indications of several rapid radiations. Clades are morphologically distinct, corresponding to sections that should be recognized. Biogeographic analyses suggest multiple radiations into North America by the blue-eyed grasses, possibly via the Antilles rather than the more well-known Panama Isthmus. Additionally, the yellow-eyed grasses are paraphyletic relative to the blue-eyed grasses, and each of the constituent clades appear to have separate centers of diversity. Several clades are spread throughout the range of the genus, while others are geographically restricted, perhaps by pollinator specificity.
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1 - Rancho Santa Ana Botanic Garden, 1500 N. College, Claremont, California, 91711, USA
Presentation Type: Oral Paper:Papers for Sections
Date: Wednesday, August 2nd, 2006
Time: 9:15 AM