Description from Flora of China
Abies chengii Rushforth; A. delavayi Franchet var. forrestii (Coltman-Rogers) A. B. Jackson; A. forrestii var. chengii (Rushforth) Silba.
Trees to 20 m tall; bark dark gray, flaking; branchlets red-brown or brown, darkened or turning dark gray in 2nd or 3rd year, initially puberulent; winter buds globose or obovoid, resinous. Leaves ascending on upper side of branchlets, pectinately arranged in 2 lateral sets on lower side, bright green adaxially, linear, (1.5-)2-3(-4) cm × 2-2.5 mm, stomatal lines in 2 white bands abaxially, resin canals 2, marginal, apex emarginate, rarely acute or obtuse. Seed cones sessile, dark brown-purple or black-brown at maturity, cylindric or shortly so, 7-12 × 3.5-6 cm. Seed scales at middle of cones flabellate-trapeziform, 1.3-2 × 1.3-2.3 cm, margin auriculate laterally. Bracts cuneate-obovate, distal margin broadly rounded, apex with exserted, straight or recurved cusp 4-7 mm. Seeds ca. 1 cm; wing light brown or red-brown, broadly cuneate. Pollination May, seed maturity Oct-Nov.
The timber is used for construction, and tannin is extracted from the bark.
* Mountains; 2500-4200 m. SW Sichuan, E Xizang, NW Yunnan