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Taxonomy and Distribution of a Natural Group of Black Oaks of Mexico (Quercus, Section Lobatae, Subsection Racemiflorae)
Richard Spellenberg and Jeffrey R. Bacon
Vol. 21, No. 1 (Jan. - Mar., 1996), pp. 85-99
Published by: American Society of Plant Taxonomists
Stable URL: http://www.jstor.org/stable/2419565
Page Count: 15
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A taxonomy of a small section of Mexican black oaks (Quercus, section Lobatae, subsection Racemiflorae) is presented. Four species are recognized; Q. conzattii, Q. radiata, Q. tarahumara, Q. urbanii. All are annual-fruited, the acorns in racemose inflorescences ranging from condensed or reduced to elongate, the species differing by characteristics of inflorescences and foliar pubescence. Quercus urbanii and Q. conzattii are bicentric, each occurring in the southern part of the Sierra Madre Occidental and again several hundred kilometers to the south. Both have leaves densely lanate and moderately glandular on the abaxial surface; Q. urbanii has robust inflorescences 4-17 cm long whereas Q. conzattii has more delicate inflorescences 0.5-6 cm long. Quercus tarahumara and Q. radiata are restricted to the northern and southern parts of the Sierra Madre, respectively. Both have leaves conspicuously glandular and sparsely lanate on the abaxial surface; inflorescences are rather robust, those in Q. radiata openly racemose and 5-19 cm long, those of Q. tarahumara dense, compact, and 0.5-4 cm long.
Systematic Botany © 1996 American Society of Plant Taxonomists