灰背叶柯 hui bei ye ke

Pasania hypoglauca Hu, Bull. Fan Mem. Inst. Biol., Bot. 10: 101. 1940; Lithocarpus houanglipinensis A. Camus; L. wangianus A. Camus; Pasania yungjenensis Hu.

Trees 10-20 m tall. Branchlets glabrous. Petiole 1.5-2 cm; leaf blade ovate to lanceolate, 7-15 × 2-6 cm, thickly papery, concolorous when young, abaxially glaucous and often with scurfy scalelike glands with age, adaxially glabrous, base attenuate-cuneate and decurrent on petiole, margin entire, apex acuminate to acute; secondary veins 7-9 on each side of midvein; tertiary veins abaxially inconspicuous. Male inflorescences solitary or in a panicle, 6-15 cm. Female inflorescences at apex of branches, 7-15 cm; rachis with scurfy scalelike glands; cupules in clusters of (2 or)3. Cupule plate-shaped when mature, 1.5-5 mm × 1.2-1.8 cm, covering on base of nut, wall 0.5-1.5 mm thick; bracts imbricate, triangular, small, appressed, with tawny, scurfy scalelike glands. Nut depressed globose to broadly conical, 1-1.5 × 0.8-2 cm, apex slightly concave to pointed, wall ca. 0.5 mm thick; scar 0.8-1.2 cm in diam., concave. Fl. Jul-Sep, fr. Aug-Oct of following year.

* Mixed mesophytic forests; 1700-3000 m. SW Sichuan, NW Yunnan