Wilson, C. .
Phylogenetics and character evolution of Iris subgenus Iris.
Iris is a Northern Hemisphere genus with about 260 geophytic species that have colorful perianth whorls, nectar guides and petaloid style branches. Five subgenera are currently recognized including the large (approximately 95 species) and morphologically diverse subgenus Iris, the focus of this study. Phylogenetic analyses included about 60% of the species in subgenus Iris and utilized cpDNA and nrDNA sequence data. The subgenus and its two largest sections, Oncocyclus and Iris, were resolved as monophyletic while three small and relatively unknown sections, Pseudoregelia, Psammiris, and Regelia, were not supported. The phylogenetic relationships revealed provide new information on the evolution of key vegetative and floral characters such as leaf form, rhizome size and form, floral trichomes, color spots, and style crest form and orientation.
Iris subgenus Iris species are parental to most horticultural irises, plants that are popular and often drought resistant. Some of the species are rarely collected and relatively unknown. Vegetative and floral organs interact with biotic and abiotic factors during geographical spread and species diversification The showy and modified flowers of Iris are important in pollinator interaction and possibly co-evolution. Several species in subgenus Iris show a reduction in rhizome size that may be transitional forms to bulbs. Geophytic structures, especially bulbs, are important agricultural crops and may be especially suited to dry, warm and/or seasonally extreme habitats. In many regions of the World Iris species are rare in nature leading several nations to protect all species.
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1 - Rancho Santa Ana Botanic Garden, 1500 N. College, Claremont, California, 91711, USA
Presentation Type: Oral Paper:Papers for Sections
Location: 555A/Convention Center
Date: Monday, August 2nd, 2010
Time: 10:15 AM