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Systematics Section / ASPT

Islam, Melissa B. [1], Simmons, Mark P. [1].

Phylogenetic Relationships in Ziziphus (Rhamnaceae): Testing Alternative Generic Classifications.

Ziziphus consists of approximately 170 species in the tropics, subtropics and warm temperate regions. Two economically important species, Ziziphus jujuba Mill. and Z. mauritiana Lam., are cultivated for their fruit primarily in China and India, respectfully. Given the economic importance of these two species, we undertook a reexamination of the intrageneric phylogenetic relationships to identify their immediate relatives and test three alternative intrageneric classifications by Suessenguth (1953), Schirarend (1991), and Liu and Cheng (1995). These three morphology-based classifications were tested by using a simultaneous analysis of morphological characters together with nuclear (ITS and 26S rDNA) and plastid (trnL-F) genes. The Old World and New World species of Ziziphus were resolved into two separate well supported clades, which is consistent with Schirarend's (1991) classification but inconsistent with the two alternative classifications. The New World species differ morphologically from the Old World species by the presence of shortened, thorn-tipped lateral branches and the absence of spinescent stipules. Paliurus was resolved as more closely related to the Old World species of Ziziphus than were the New World species, thereby making Ziziphus paraphyletic. Indeed, the Old World species of Ziziphus species have been previously recognized as closely related to Paliurus, with the two groups only differing by their fruit type.


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1 - Colorado State University, Department of Biology, Fort Collins, Colorado, 80523-1878, USA

Keywords:
Rhamnaceae
Ziziphus
Paliurus
Economic botany
Biogeography.

Presentation Type: Oral Paper
Session: 44-12
Location: Salon G - Austin Grand Ballroom/Hilton
Date: Wednesday, August 17th, 2005
Time: 11:15 AM
Abstract ID:99


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