Whittemore, Alan .
Apomixis and ploidy in North American Celtis (Cannabaceae).
The genus Celtis has long been recognized as a taxonomically difficult group, in which species boundaries are obscured by plants showing apparently intermediate morphology. This pattern of variation is due to the extensive occurrence of apomictic populations across North America. Apomicts show high levels of aborted pollen in the flowers. Flow cytometry indicates that sexual populations in North America are diploid and apomictic populations are triploid. Embryological work carried out by Hiroshi Tobe indicates that apomixis is aposporous.
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1 - U. S. National Arboretum, 3501 New York Ave NE, Washington, DC, 20002, USA
Presentation Type: Oral Paper:Papers for BSA Sections
Location: Cottonwood D/Snowbird Center
Date: Tuesday, July 28th, 2009
Time: 2:15 PM