| Abstract Detail
Systematics Section / ASPT Wagner, Warren L. [1], Hoch, Peter C. [2]. Revised Classification of the Evening Primrose family (Onagraceae). Molecular phylogenetic analyses in the plant family Onagraceae support the need for changes in the family classification. The most dramatic changes mainly involve the tribe Onagreae, from which we have segregated Gongylocarpus as its own tribe, sister to the tribes Epilobieae and Onagreae, and within which we propose changes in the delimitation of Camissonia and Oenothera. Camissonia as currently defined is broadly paraphyletic; our new classification recognizes nine generic lineages (Camissonia, Camissoniopsis, Chylismia, Chylismiella, Eremothera, Eulobus, Holmgrenia, Taraxia, and Tetrapteron) that form a grade at the base of Oenothera. Each of these lineages is well-supported by morphological and molecular data. In contrast, both molecular and morphological data suggest the need to broaden the delimitation of Oenothera to include Calylophus, Gaura, and Stenosiphon. This redefined Oenothera, strongly supported by molecular data, is marked by at least two morphological synapomorphies: presence of an indusium on the style, and a lobed or peltate stigma. We will summarize the basis for these new generic alignments and review the morphological characters used to diagnose tribe Onagreae, and each of the genera.
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1 - Smithsonian Institution, Natural History - Botany, P.O. Box 37012, Washington, DC, 20013-7012
2 - Missouri Botanical Garden, Po Box 299, St Louis, Missouri, 63166-0299, USA
Keywords:
Onagraceae
molecular phylogeny
Camissonia
Oenothera.
Presentation Type: Oral Paper:Papers for Sections
Session: CP56
Location: Stevens 3/Hilton
Date: Wednesday, July 11th, 2007
Time: 1:45 PM
Number: CP56003
Abstract ID:2324 |
