大叶柯 da ye ke

Lithocarpus pleiocarpus A. Camus; Quercus mairei H. Léveillé (1913), not Pasania mairei Schottky (1912).

Trees 15-25 m tall. Branchlets glaucous, glabrous, lenticellate. Petiole 2.5-6 cm, 3-6 mm thick; leaf blade obovate, obovate-elliptic, or elliptic, 14-30 × 6-13 cm, rigidly leathery, concolorous, abaxially with grayish, pulverulent scalelike glands (visible under hand lens), adaxially glabrous, base cuneate to subrounded, margin entire, apex acute; secondary veins 14-18 on each side of midvein, abaxially strongly raised, adaxially impressed; tertiary veins abaxially conspicuous, subparallel. Male panicle to 20 cm; rachis sparsely pubescent when young. Female inflorescences usually at apex of branches; cupules in clusters of 3(-5), sometimes solitary. Infructescences 10-14 cm; rachis 1-1.5 cm thick. Cupule plate-shaped to cupular, 4-10 mm × 2-3 cm, enclosing 1/6-1/3 of nut, wall 1-2 mm thick; bracts 1-1.4 mm. Nut conical and 2.4-2.8 × 2-2.5 cm to depressed globose and 1.6-1.8 × 2.8-3.2 cm, slightly shining, sometimes ± white farinose, apex flat or with a ± concave center, wall ca. 1 mm thick; scar 1.2-1.8 cm in diam., concave. Fl. May-Jun, fr. May-Jun of following year.

Mixed mesophytic forests; 900-2200 m. W Guangxi, N Guizhou, W Hubei, W Sichuan, E Yunnan [NE Vietnam]