Cohen, Jim .
A phylogenetic analysis of morphological and molecular characters of Boraginaceae: Taxonomic reevaluations and character evolution.
Boraginaceae, a family that includes ca. 112 genera and 1600 species, is one of the largest plant families without a comprehensive and critical phylogeny. Multiple generic- and tribal-level phylogenetic studies have provided evidence that the current taxonomy of the family is not aligned with modern practices; therefore, a family-wide phylogeny would be useful in the reevaluation of the taxonomy of Boraginaceae. To this end, a matrix of 23 morphological characters and multiple chloroplast DNA regions was constructed for approximately half of the genera of the family. The results of the phylogenetic analyses of this matrix recover four well supported, monophyletic tribes: Boragineae, Cynoglosseae, Echiochileae, and Lithospermeae. Among these tribes, Cynoglosseae exhibits greater variation in fruit morphology, while Lithospermeae shows more diversity in floral morphology. Among all members of the family, some characters, including cleistogamy and heterostyly, originated multiple times, whereas others, such as leaf venation and the presence/absence of floral bracts, are less variable, and tend to characterize larger clades. An understanding of the patterns of character evolution in the family will allow for the identification of characters or suites of characters that diagnose tribes and groups of genera.
Log in to add this item to your schedule
1 - texas a&m international univesity, Biology and Chemistry, 5201 University Blvd, Laredo, TX, 78041, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Lindell A/Chase Park Plaza
Date: Tuesday, July 12th, 2011
Time: 8:45 AM