3. Mastixia caudatilimba C. Y. Wu ex T. P. Soong, J. Sichuan Univ., Nat. Sci. Ed. 1982(1): 66. 1982.
长尾单室茱萸 chang wei dan shi zhu yu
Trees, evergreen, to 23 m tall. Branches opposite, dark brown, terete, glabrous or subglabrous; young branches slender, ridged. Leaves opposite; leaf blade elliptic, broadly elliptic, or oblong, 8–13 × 2.5–6 cm, leathery, abaxially glabrous, veins 6 or 7, ascending shortly, ending at margin, base somewhat rounded or broadly cuneate, slightly decurrent and oblique, margin entire or slightly undulate, slightly revolute, apex caudate. Inflorescences panicles, terminal, 5–6 cm, loosely flowered, densely pubescent; bracteoles narrowly triangular. Flowers not observed (floral characters taken from fruit), 4-merous. Calyx lobes 4. Disk circular, slightly 4-lobed, with scars of 4 stamens. Style ca. 2 mm. Fruit dark brown after drying, oblong, ca. 2 cm, ca. 9 mm in diam., calyx and style persistent. Fl. buds Mar, fr. Oct–Dec.
Subtropical forests, sparse wet forests in valleys; 1400–1600 m. S Yunnan (Xishuangbanna: Nannuo Shan).