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Abstract Detail

Systematics Section/ASPT

Namoff, Sandra [1], Porter, J. Mark [1].

Molecular phylogenetic evidence for species relationships in genus Calystegia (Convolvulaceae).

Calystegia R. Br. is a pan temperate genus of vining perennials currently estimated to have 23 species. The lineage is well represented in California with 14 species and ca. 40 recognized subspecific taxa. Understanding diversity in this group has historically been difficult. Under the current treatment species boundaries are weakly defined and intermediate forms are common where species co-occur, especially in disturbed habitats. This syndrome is consistent with incipient speciation processes where maintenance of species boundaries is contingent upon microenvironment heterogeneity or geographic disjunction in the absence of reinforcement. Phylogenetic reconstruction based on nuclear and chloroplast sequence data was used to estimate the evolutionary relationship within the genus. Results indicate that bracteole morphology, which has traditionally been used to define relationships within the genus, is highly labile. Additionally, results show that previous phylogenetic hypotheses regarding the origin and diversification of the genus in California are not supported. Finally, independent analyses of nuclear and chloroplast trees indicated that newly discovered taxon, Calystegia vanzuukiae, is likely of hybrid origin. 

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1 - Rancho Santa Ana Botanic Garden, Research, 1500 N. College Avenue, Claremont, CA, 91767, USA

Molecular phylogenetics

Presentation Type: Oral Paper:Papers for Sections
Session: 30
Location: Payette/Boise Centre
Date: Tuesday, July 29th, 2014
Time: 2:00 PM
Number: 30003
Abstract ID:885
Candidate for Awards:George R. Cooley Award

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