Quercus Praineana Trel. 1924

Twigs rather slender (2-3 mm.), scarcely fluted, glabrous, dull dark red becoming
grayish the second season, with numerous small but prominent lenticels. Buds rather
glossy red, glabrescent or somewhat gray-hairy above, ovoid, 2 x 4 to 4 x 6 mm. Leaves
deciduous, elliptical-lanceolate, mucronately acute to obtuse, somewhat acute to typically
rather truncate at base, entire or somewhat undulate above, moderate (3-4.5 x 7-10 cm.),
rather glossy, glabrous and minutely venulose above, paler, duller, somewhat axillary-tufted
and less venulose beneath; veins about 8 pairs, looped; petiole glabrous, 10 mm. long.
Catkins: female scarcely 3 mm. long, 2-flowered. Fruit biennial, very short-stalked;
cup saucer-shaped, rather small (12 mm. in diameter), with thin appressed blunt
silvery-puberulent scales; acorn equally silvery, ovoid, 12 mm. long, covered at
base only.
Western Sierra Madre region of Mexico.