01691nas a2200217   4500008004100000245009600041210006900137300001400206490000700220520098700227653001201214653003201226653001401258653001101272653002801283100002301311700003801334700002501372700003201397856004401429       2011                        eng d00aThe taxonomic status of the Mexican oak Quercus undata (Fagaceae, Quercus, section Quercus)0 ataxonomic status of the Mexican oak Quercus undata Fagaceae Quer  a1123-11310 v823 a<p>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&rsquo;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.</p>
10aepitype10aintrogressive hybridization10alectotype10aMexico10aSierra Madre Occidental1 aBacon, Jeffrey, R.1 aDávila-Aranda, Patricia, Dolores1 aSpellenberg, Richard1 aGonzález-Elizondo, Socorro  uhttps://quercus.myspecies.info/node/179