TY - JOUR T1 - The taxonomic status of the Mexican oak Quercus undata (Fagaceae, Quercus, section Quercus) JF - Revisita Mexicana de Biodiversidad Y1 - 2011 A1 - Bacon, Jeffrey R. A1 - Dávila-Aranda, Patricia Dolores A1 - Spellenberg, Richard A1 - González-Elizondo, M. Socorro SP - 1123 EP - 1131 KW - epitype KW - introgressive hybridization KW - lectotype KW - Mexico KW - Sierra Madre Occidental AB -

Quercus undata Trel. (Fagaceae, Quercus, Section Quercus) has a complex taxonomic and nomenclatural history. Intensive sampling of oaks at the type locality of Q. undata Trel. in Durango, Mexico and evaluation of herbarium specimens and plants in the field indicate that Q. undata represents variation in Quercus chihuahuensis Trel. in white oak communities where introgressive hybridization among Q. chihuahuensis, Q. grisea Liebm., and a third white oak, Q. arizonica Sarg. made species identification difficult. Endlich’s type specimen of Q. undata, as designated by Trelease, was apparently destroyed in bombing raids on Berlin during World War II, and we propose herein as lectotype the Trelease illustration of the type. An epitype is also designated in support of the lectotype, given that some features cannot be critically observed on the illustration. The long peduncles of the specimen illustrated by Trelease indicate a close relation to Q. chihuahuensis.

VL - 82 ER -