Pygeum topengii Merr.

Trees to 25 m tall. Bark dark gray to grayish brown. Branchlets dark brown, brown pubescent when young, glabrescent, with orbicular small lenticels. Winter buds ovoid, 2.5–5 mm, brown pubescent, apex acute. Petiole 5–8 mm, brown pubescent; leaf blade ovate-elliptic to elliptic, 6–12 × 3–5.5 cm, leathery, abaxially brown appressed pubescent and more densely so along midvein and secondary veins but glabrescent or only very sparsely pubescent and with 2 black nectaries near base, adaxially lustrous and glabrous, base broadly cuneate and asymmetric, margin entire, apex shortly acuminate and with an apical obtuse tip; secondary veins 5–8 on either side of midvein, abaxially raised. Racemes solitary or to several in a fascicle, 4–7 cm, many-flowered; rachises, pedicels, bracts, hypanthia, and sepals densely brown pubescent; bracts small, ovate-lanceolate to lanceolate, soon caducous. Flowers 2–3 mm in diam. Pedicel 1–3 mm. Hypanthium obconic, 2–2.5 mm. Sepals 5 or 6, triangular-ovate, 1–2 mm; apex acute. Petals as many as sepals, oblong, slightly longer than sepals or undistinguishable from sepals, outside brown pubescent, apex ± obtuse. Ovary glabrous. Drupe dark brown, reniform, 0.8–1 × 1–1.6 cm, glabrous, apically depressed. Fl. Jun–Sep, fr. winter.

Fujian, Guangdong, Guangxi, Guizhou, Hainan, Hunan, Yunnan.

Forests, forest margins, abandoned fields, mountain valleys, along trails, stream sides; 100--1600 m.

Pygeum tokangpengii Merrill.

Pygeum topengii là loài thực vật có hoa trong họ Hoa hồng. Loài này được Merr. miêu tả khoa học đầu tiên năm 1919.

臀果木（学名：Pygeum topengii）为蔷薇科臀果木属下的一个种。