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Abstract Detail

Systematics Section/ASPT

Mayer, Michael [1], Rebman, Jon [2], Salywon, Andrew [3].

Phylogeny of the chollas (Cactaceae: Cylindropuntia) based on cpDNA sequence data.

The chollas, Cylindropuntia (Engelm.) Knuth, comprise approximately 32 species distributed across southern North America. The genus was formerly considered a subgenus under Opuntia Miller, and is distinguished by cylindrical stems and deciduous spine epidermis, among other features. Although a common and significant group, widely considered to be monophyletic, phylogenetic analysis of the entire genus has not been previously attempted. We generated sequences of four non-coding regions (rpL16, rpS16, trnH-psbA, and trnQ-5'rps16) of the chloroplast genome for nearly all species of Cylindropuntia. Resulting trees reveal relationships mostly congruent with morphological and geographic patterns. Not surprising is the close relationship shown by the slender-stemmed C. anteojoensis, C. tesajo, and C. ramossisima. Another clade of slender-stemmed species consists of C. leptocaulis, C. kleiniae, C. lindsayi, and C. caribaea, which is the only cholla native to a Caribbean island (Hispaniola). The proximity of C. leptocaulis and C. kleiniae to the gulf coast suggests the likely source of the ancestor of C. caribaea. An unexpected finding was the basal position of the fleshy-fruited C. bigelovii and its sister, C. fosbergii, thereby portraying dry fruits as a derived state that must have arisen multiple times in the history of the genus.

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1 - UNIVERSITY OF SAN DIEGO, Department of Biology, 5998 ALCALA PARK, SAN DIEGO, CA, 92110-2492, USA
2 - San Diego Natural History Museum, Herbarium, P.O. Box 1390, San Diego, CA, 92112, USA
3 - Desert Botanical Garden, 1201 N Galvin Parkway, Phoenix, AZ, 85008-3490, USA


Presentation Type: Oral Paper:Papers for Sections
Session: 4
Location: Magnolia/Riverside Hilton
Date: Monday, July 29th, 2013
Time: 8:45 AM
Number: 4002
Abstract ID:591
Candidate for Awards:None

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