Description from Flora of China
Pasania bonnetii Hickel & A. Camus, Ann. Sci. Nat., Bot., ser. 10, 3: 402. 1921.
Trees to 20 m tall. Branchlets stout, terete, tawny tomentose. Petiole 1.5-2 cm, thick; leaf blade oblanceolate to obovate-oblong, 15-24 × 6-9 cm, leathery, abaxially tawny tomentose when young, base narrowed, margin entire or ± undulate near apex, apex acute; secondary veins 12-16 on each side of midvein, adaxially impressed, apical ones abruptly curving apically, fusing near margin; tertiary veins abaxially inconspicuous, ± parallel. Infructescences 6-13 cm; rachis tawny tomentose. Cupules in clusters of ca. 3 but only 1 or 2 devel- oped, 0.8-1 × 1.6-1.8 cm, enclosing slightly more than 1/2 of nut, wall less than 1 mm thick; bracts linear, 2-3 mm, puberulent. Nut depressed conical, 1.2-1.4 × 1.4-1.6 cm, apex narrowed, wall less than 0.5 mm thick; scar 8-9 mm in diam., deeply concave. Fl. May-Jun, fr. Jul-Aug of following year.
Very close if not the same as Lithocarpus garrettianus; the only difference is the length of the cupule bracts.
Mixed mesophytic forests in mountain valleys; 700-1300 m. SW Hainan, SE Yunnan [C to NE Vietnam]