Resumen

SABAS-ROSALES, José Luciano; SIQUEIROS-DELGADO, María Elena; VALENCIA-AVALOS, Susana  y  ENRIQUEZ-ENRIQUEZ, Enrique David. Taxonomic recognition of six shruby oak species (Quercus secc. Quercus: Fagaceae). Polibotánica [online]. 2017, n.44, pp.11-38. ISSN 1405-2768.  https://doi.org/10.18387/polibotanica.44.2.

In the genus Quercus there are groups of species with similar morphological characters that complicate their identification. The species Quercus cordifolia Trel., Q. deliquescens C. H. Mull., Q. intricata Trel., Q. microphylla Née, Q. mohriana Buckley y Q. striatula Trel., conform one of those groups, in which species are difficult to recognize among them; all of them have a shrubby habit, stellate trichomes beneath the small leaves, and some of them have a sympatric distribution. Therefore, with the intention to obtain diagnostic data that allow recognition of each species of this group and its corresponding taxonomical status, we performed a critical analysis of the protologues, type images and other specimens available in virtual herbaria, and a review of herbaria; the localities where most of the type specimens were collected, were also visited, and all available morphological characters with emphasis in the foliar trichomes observed by Scanning Electron Microscopy were analyzed. The results allowed the taxonomic recognition of the six species previously described. The trichomes, fruits, leaves (indument, shape, margins, number of secondary veins, and consistency) provide the characters that together allow recognition of each of the species of this group.

Palabras llave : identification; morphology; Quercus; taxonomy; trichomes.

        · resumen en Español     · texto en Español     · Español ( pdf )