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A NEW SPECIES OF BLACK OAK (QUERCUS, SUBG. ERYTHROBALANUS, FAGACEAE) FROM THE SIERRA MADRE OCCIDENTAL, MEXICO
1Department of Biology, New Mexico State University, Las Cruces, New Mexico, 88003.
Abstract:
Quercus mcvaughii is described as a new species of black oak (subgenus Erythrobalanus) from the Sierra Madre Occidental, in northern Durango and western Chihuahua, Mexico. It is most closely related to the more southern Q. crassifolia. Sessile or subsessile hairs, usually of different sizes, on the abaxial leaf surface distinguish Q. mcvaughii from Q. crassifolia, where hairs are similar in size and conspicuously stipitate. A key is provided for distinguishing similar species in the region. Intergradation of Q. mcvaughii with Q. crassifolia, Q. hypoleucoides, and Q. sideroxyla is reported.
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