白皮柯 bai ke

Quercus dealbata J. D. Hooker & Thomson ex Miquel, Ann. Mus. Bot. Lugduno-Batavi 1: 107. 1863; Lithocarpus tapintzensis A. Camus; L. viridis (Schottky) Rehder; Pasania dealbata (J. D. Hooker & Thomson ex Miquel) Oersted; P. viridis Schottky p.p. (syntype A. Henry 9636); P. yenshanensis Hu; Q. thalassica Hance var. vestita Franchet; Synaedrys dealbata (J. D. Hooker & Thomson ex Miquel) Koidzumi.

Trees rarely to 20 m tall; bud scales, branchlets, petioles, leaf blades abaxially, rachis of inflorescences, and scales of cupule tawny tomentose with short hairs. Petiole 1-2 cm; leaf blade ovate, ovate-elliptic, or lanceolate, 7-14 × 2-5 cm, thickly papery to leathery, concolorous or abaxially grayish and with waxy scale, base cuneate, margin entire or rarely apically shallowly undulate, apex acuminate to acute; midvein adaxially slightly raised and usually sparsely pubescent; secondary veins (8-)10-13 on each side of midvein; tertiary veins abaxially conspicuous, ± parallel. Male inflorescences clustered at apex of branches, rarely to 15 cm. Female inflorescences sometimes androgynous, rarely to 20 cm; cupules in clusters of 3(-5). Infructescences usually 5-8 cm. Cupule cupular, 0.8-1.4 × 1-1.8 cm, enclosing 1/2 to most of nut; bracts imbricate, triangular, appressed or a few spreading. Nut depressed globose to subglobose, slightly smaller than cupule, apex rounded, ± flat, or rarely convex, wall ca. 1 mm thick; scar covering ca. 1/3 (-1/2) of nut, convex. Fl. Aug-Oct, fr. Aug-Oct of following year.

Mixed mesophytic forests, usually in association with Pinus yunnanensis, Picea, and other species of Fagaceae; 1000-2800 m. Guizhou, SW Sichuan, SE Xizang, Yunnan [Bhutan, NE India, N Laos, NE Myanmar, N Thailand, Vietnam]