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Abstract Detail


Wilson, C. [1].

Phylogeny and Biogeography of North American and Asian Limniris (Iridaceae).

IRIS is a Northern Hemisphere genus with about 300 species. Previous studies have shown that the two largest subgenera, Iris and Limniris, are both polyphyletic. In this study matK, trnL-F and ITS sequence data is used to further examine subgenus Limniris. The subgenus has been previously defined based on the presence of rhizomes and absence of sepal beards. Within subgenus Limniris two sections have been recognized, section Lorphiris with seed arils and sepal crests, and section Limniris whose species lack these two characters. Both sections were resolved as polyphyletic. Section Lophiris appears to be an assemblage of species that are unrelated on the resulting tree. To date six separate origins have been determined for species currently considered within section Limniris although some previously recognized series are monophyletic. The hypothesized origin of North American species through two introductions from Asia is not supported. The origin of North American species is not fully known but preliminary results indicate several exchanges between the two continents.


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1 - Rancho Santa Ana Botanic Garden, 1500 N. College, Claremont, California, 91711, USA

Keywords:
Iris
Iridaceae
Limniris
biogeography
Asia
North America.

Presentation Type: Array
Session: 63-5
Location: 120/Ayres
Date: Wednesday, August 2nd, 2006
Time: 9:00 AM
Abstract ID:642


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