Trees , deciduous, to 25 m. Bark dark brown with flat ridges divided by shallow fissures. Twigs red-brown to gray, 1.5-3(-3.5) mm diam., glabrous. Terminal buds gray to gray-brown, ovoid, 3-7 mm, glabrous or with scales somewhat ciliate at apex. Leaves: petiole 20-50 mm, glabrous. Leaf blade ovate to elliptic or obovate, 75-200 × 55-130 mm, base cuneate to almost truncate, often inequilateral, margins with 6-11 lobes and 9-24 awns, lobes oblong to distally expanded, rarely falcate, apex acute; surfaces abaxially glabrous except for conspicuous axillary tufts of tomentum, veins raised, adaxially planar, glabrous. Acorns biennial; cup thin (scale bases visible on inner surface), deeply goblet-shaped with pronounced constriction at base, 10-16 mm high × 15-22 mm wide, covering 1/3-1/2 nut, outer surface glabrous to sparsely puberulent, inner surface sparsely to uniformly pubescent, scale tips appressed, acute; nut broadly ovoid to broadly ellipsoid, 15-26 × 13-18 mm, glabrous or sparsely puberulent, scar diam. 8-13 mm, scar often orangish.
|Texas red oak, Nuttall's oak|