Castanopsis tsaii Hu; Synaedrys delavayi (Franchet) Koidzumi.

Trees ca. 20 m tall. Branches glabrous. Petiole 0.7-1.5 cm; leaf blade obovate, obovate-elliptic, ovate, or elliptic, 5-13 × 3-7 cm, subleathery, abaxially sparsely covered with yellowish brown membranous trichomes when young, grayish to silver-gray with age, base acute to rounded, margin serrate or rarely undulate, apex acute to rounded; midvein adaxially raised; secondary veins 6-9 on each side of midvein, slightly raised. Female inflorescence rachis glabrous. Infructescences 10-15 cm; rachis 2-3 mm thick. Cupule ellipsoid when young but broadly ovoid to subglobose with age, 1.5-2 cm in diam. or slightly larger, splitting into 2 or 3 segments, outside with yellowish brown, waxy scalelike trichomes and adnate pubescence, basally long stalked, wall 0.5-1 mm thick; bracts spinelike, 3-6 mm, free or connate at base and transversely united to 3-5 circular or spiral rings, covered with yellowish brown waxy scalelike trichomes and adnate pubescence. Nut broadly ovoid, 1.3-1.4 cm in diam.; scar basal, 6-8 mm in diam. Fl. Apr-May, fr. Sep-Nov of following year.

* Mixed and broad-leaved evergreen forests; 1500-2800 m. Guangdong, SW Guizhou, SW Sichuan, Yunnan