上思厚壳树 shang si hou ke shu

Trees 3-5 m tall; branches gray-brown; branchlets brown, glabrous, with linear or oblong lenticels. Leaf blade elliptic to oblong-elliptic, 5-12 × 3-6.5 cm, glabrous, abaxially pubescent only in vein axils, base cuneate, margin entire, apex abruptly acute; lateral veins 5 or 6 pairs, reticulate veins obvious. Cymes terminal and lateral, flat topped, 3-8 cm wide, obscurely pubescent. Calyx 1.5-2.5 mm, obscurely glandular pubescent; lobes ovate, 1-1.5 mm, ciliolate. Corolla white, tubular-campanulate, fragrant, 7-8.5 mm, base 1.5-2 mm wide, gradually expanded upward; throat 3-4.5 mm wide; lobes oblong, 3-4 mm, shorter than tube, margin revolute. Filaments 2.5-3.5 mm, inserted at upper part of base, 3-4 mm; anthers 1.5-2 mm. Style 5-6 mm, glabrous, branches ca. 1 mm. Drupes yellow, ca. 5 mm in diam.; endocarp divided at maturity into 4 1-seeded pyrenes. Fl. Mar, fr. Apr.

* Valley forests; 200-500 m. S and W Guangxi, S Guizhou, SE Yunnan.