硬叶柯 ying ye ke

Lithocarpus pachyphylloides Y. C. Hsu & al.

Trees to 10 m tall. Branchlets dark brown when dry, lenticellate. Petiole 2-5 mm; leaf blade broadly elliptic to obovate, 5-9 × 3-5 cm, rigidly leathery, yellowish brown when dry, abaxially covered with appressed hairs on midvein and with waxy scalelike trichomes when young, base broadly cuneate, margin entire and slightly recurved, apex rounded, obtuse, or rarely acute; secondary veins 6-9 on each side of midvein, adaxially slightly impressed, sometimes ramified near margin; tertiary veins abaxially slender, evident to inconspicuous. Infructescences 3-5 cm; rachis 4-6 mm thick, glabrous, lenticellate; cupules in clusters of ca. 3. Cupule cupular, 0.8-1.2 × 1.5-2.2 cm, enclosing 1/3-1/2 of nut, wall ca. 2 mm thick; bracts imbricate, triangular, appressed, with loose, rust-colored, waxy scalelike trichomes. Nut depressed, 1-1.2 × 1.5-1.8 cm, glabrous; scar covering 1/4-1/3 of nut, convex but margins ± impressed. Fr. Aug.

Broad-leaved evergreen forests; circa 2700 m. S Yunnan [N Laos, Vietnam]