Systematics/Phytogeography / Taxonomie/ Section
Wilson, C. .
Monophyly and phylogenetics of series Sibericae in Iris section Limniris.
Series Sibericae as currently delineated has 11 species distributed in Europe and Asia of which nine are known to be extant. Species have medium-sized rhizomes that produce narrowly linear leaves, sepals that have colorful pollen guides and lack beards, and relatively large pollen grains that have a simple exine and an operculum. I investigated this series and several outgroup species from other series in section Limniris to determine the monophyly of the group and to explore relationships among species. Chloroplast sequence data resolved series Sibericae as polyphyletic because the only species distributed in Europe and central Asia, I. sibirica, was nested in a clade comprised of species from series Laevigatae and Tripetalae. This finding is surprising because I. sibirica and I. sanguinea (resolved with other series Sibericae species) share a chromosome number of 2n=28 and produce fertile offspring when crossed. Based on sequence data I. henryi, an eastern Asian species that is currently placed in series Chinensis, was nested within the series Sibericae clade. A monophyletic series Sibericae is comprised of nine extant species restricted to the Himalayan region and eastern Asia with an ancestral chromosome number of x=40. Within the monophyletic series Sibericae, species formed two major clades that show divergence in chromosome number.
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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: Tuesday, July 29th, 2008
Time: 1:45 PM