Systematics Section / ASPT
Hoch, Peter C. , Wagner, Warren L. .
Toward a new classification for Onagraceae.
RECENT 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 five generic lineages (Camissonia, Chylismia, Chylismiella, Eulobus, and Taraxia) that form a grade at the base of Oenothera. Each of the lineages is well-supported morphologically, except Camissonia s.s., which may require further subdivision. On the other hand, 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 this new generic alignment and review the morphological characters used to diagnose the genera in tribe Onagreae.
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1 - Missouri Botanical Garden, Po Box 299, St Louis, Missouri, 63166-0299, USA
2 - Smithsonian Institution, Natural History - Botany, P.O. Box 37012, Washington, DC, 20013-7012
Presentation Type: Oral Paper:Papers for Sections
Location: 134/Performing Arts Center
Date: Tuesday, August 1st, 2006
Time: 10:30 AM