西藏柯 xi zang ke

Trees to 30 m tall. Branchlets of last year growth, petioles, and abaxial leaf blade surface pubescent. Petiole 2-4 cm, stout, pubescent; leaf blade elliptic to obovate-elliptic, 25-40 × 9-15 cm, papery, abaxially pubescent, base cuneate, margin entire or sometimes apically undulate, apex acute; secondary veins 11-16 on each side of midvein, adaxially impressed when young, pubescent, covered with adherent scurfy scalelike trichomes, grayish when dry; tertiary veins abaxially conspicuous. Male inflorescences solitary, ca. 25 cm. Infructescence to 20 cm, rachis lenticellate, base 1-1.2 cm thick; cupules in clusters of 3-5. Cupule globose, (5-)7-9 cm in diam. including bracts, completely enclosing nut; bracts subulate, completely covering cupule, 1.5-2.5 cm, straight or apical ones slightly curved, ± woody, pubescent. Nut broadly conical, ca. 2.5 × 2.8 cm, covered with minute hairs, base slightly narrowed, apex flat or slightly convex, wall 1-2 mm thick; scar covering ca. 2/3 of nut, convex. Fl. Aug-Sep, fr. Sep-Oct of following year.

* Broad-leaved evergreen forests; 1700-2000 m. SE Xizang (Mêdog Xian)