Quercus productipes Trel. 1924
Twigs moderate (3-4 mm.), somewhat fluted, transiently tawny-floccose,
redbrown with minute lenticels when denuded. Buds rather glossy brown, from
brown-lanate glabrescent, ovoid, 3 x 4 mm. Leaves deciduous, elliptical or somewhat
widened upwards, very obtuse, aristate from the midrib and often from several of the
upper veins, cordate or almost auricled at base, entire or undulate, somewhat crisped
and minutely cartilaginousrevolute, moderate (3.5-5.5 x 6.5-10 cm.), slightly glossy,
glabrate or somewhat stellate-fleecy in sheltered places, especially beneath; veins about
8 pairs, often with fainter intermediates, usually branched and looped; petiole hairy,
2 x 5-10 mm. Catkins: female 30 mm. long, glabrescent, interruptedly several-flowered.
Fruit biennial ?, the young cup with thin appressed blunt glabrescent brown scales;
acorn (normal?) very slender, 7 x 16 mm., evidently long-exserted.
Western Sierra Madre region of Mexico.