Quercus cyclobalanoides Trelease.

Twigs stout (3-6 mm.), fluted, glabrous, light buff with very prominent lenticels.
Buds brown, glabrate, round-ovoid, 3-4 mm. in diameter. Leaves deciduous,
oblanceolate, acute, acute or rounded at base, coarsely serrate with stoutly mucronate
teeth, slightly revolute, large (6-9 x 15-25 cm.), glossy above, glabrous; veins about
12-15 pairs, scarcely looped; petiole glabrous, 2 x 10-15 mm. Catkins?. Fruit apparently
annual; cup turbinately goblet-shaped, extremely large (50-60 mm. in diameter),
yellowish-tomentose, with about 10 encircling ridges the upper of which bear small
deltoid thin scale tips some 5 mm. apart; acorn elongated-ovoid with conical base,
thick-walled, 40-50 x 50-60 mm., becoming glabrous except for the densely yellow-tomentose
tip, the lower third covered by the cup.
Central American region.