Price, Robert , Adams, Robert P. .
The evolving classification of Callitropsis and Cupressus (Cupressaceae).
The recent discovery of the Vietnamese yellow-cypress (Xanthocyparis vietnamensis) and its similarities in cone morphology to the Nootka cypress of northwestern North America (Callitropsis nootkatensis) have focused attention on generic delimitation in the Cupressus-Juniperus clade of Cupressaceae. Sequence comparisons from multiple regions of the chloroplast and nuclear genomes strongly suggest that Callitropsis and Xanthocyparis are more closely related to the New World cypress species than any of these taxa are to the Old World cypresses (Cupressus s. str.). The New World cypresses form a distinct evolutionary group that has been treated recently as part of an expanded genus Callitropsis and as the new genus Hesperocyparis. This new generic treatment provides a useful context for evolutionary studies of this prominent western American genus of up to 16 species.
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1 - Biological Consulting, P.O. Box 448, Alameda, CA, 94501, U.S.A.
2 - Baylor University, Biology, P.O. Box 727, Grover, TX, 79040, U.S.A.
Presentation Type: Oral Paper:Papers for BSA Sections
Location: Cottonwood C/Snowbird Center
Date: Wednesday, July 29th, 2009
Time: 8:15 AM