Abstract Detail

Systematics

Zacarias-Correa, Ana Gabriela [1], Perez-Calix, Emmanuel [2], Wolfe, Andrea D. [3], Samain, Marie-Stéphanie [2].

Taxonomic revision of Penstemon section Fasciculus (Plantaginaceae) from Mexico.

Penstemon Mitch. is the largest plant genus endemic to North America, having ca. 280 species. The genus is widely variable in morphological characters, and much of this diversity is associated with evolutionary adaptations such as specialization for pollinators or ecological niches. Phylogenetic analyses for the genus used ITS and cpDNA spacer regions provided some insights into the phylogenetic relationships within the genus. However, phylogenetic relationships were not always consistent with current taxonomy, and relationships within strongly supported clades were largely unresolved. In the case of the Mexican species of Penstemon, the sampling was limited. In particular, section Fasciculus in which are included about 50 % of the Mexican species was represented by very few species. The section Fasciculus consists of 27 taxa, most of which are endemic to Mexico. A revision of Penstemon section Fasciculus has been carried out in Mexico in order to provide a uniform taxonomic treatment of its representatives. Specimens from 18 Mexican herbaria were studied and field work was carried out throughout its distribution area in Mexico. In addition to the morphological descriptions, information about habitat and distribution of each species is also incorporated. Keys for the identification of species, subsections, and sections are provided, as well as a key to all Penstemon subgenera. Distribution maps and photos are also included. The present treatment is the first one since the revision of Straw (1962, 1963) and Crosswhite (1970), and it is based on a molecular phylogeny of Penstemon section Fasciculus, especially to resolve the circumscription of doubtful taxa.

1 - Instituto de Ecologí­a, A. C., Biodiversidad y sistematica, Av. Lázaro Cárdenas 253, 61600, , Pátzcuaro, Michoacan, 61600, Mexico
2 - Instituto de Ecologí­a, A. C., Av. Lázaro Cárdenas 253, 61600,, Pátzcuaro, Michoacan, 61600, México
3 - Ohio State University, Department Of Ecology, Evolution, And Organismal Biology, 318 W. 12th Avenue, COLUMBUS, OH, 43210-1293, USA

Keywords:
Systematics
taxonomic revision
Mexico
Fasciculus.

Presentation Type: Oral Paper
Session: 17, Asterids I part B
Location: 204/Savannah International Trade and Convention Center
Date: Tuesday, August 2nd, 2016
Time: 9:15 AM
Number: 17006
Abstract ID:240
Candidate for Awards:None