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A NEW SPECIES OF BLACK OAK (QUERCUS, SUBG. ERYTHROBALANUS, FAGACEAE) FROM THE SIERRA MADRE OCCIDENTAL, MEXICO
Author(s) -
Spellenberg Richard
Publication year - 1992
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1992.tb13717.x
Subject(s) - fagaceae , subgenus , biology , botany , key (lock) , taxonomy (biology) , ecology
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.