Quercus tahuasalana Trel. 1924

Twigs slender (1-2 mm.), fluted, transiently scurfy, brown. Buds rather glossy brown, glabrescent,
round-ovoid, 1 x 2 mm. Leaves deciduous ?, linear-lanceolate, acute at both ends, entire, somewhat
crisped and minutely subrevolute, small (1.5-2 x 8-11 cm.), slightly glossy, glabrous except for
occasional axillary tufts beneath; veins about 15-20 pairs, frequently with several faint evanescent
intermediates, branched and looping; petiole from scurfy glabrescent, 1 x 5 mm. Catkins: male 50 mm.
long, nearly glabrous, rather closely flowered, the hairy ellipsoid anthers exserted. Fruit annual,
solitary, sessile; cup deep-saucer-shaped, small (scarcely 10 mm. in diameter), with thin appressed
very obtuse scales hoary below; acorn elongated and pointed, 15 mm. long, covered at base only.
Western Sierra Madre region of Mexico.