西畴油丹 xi chou you dan

Trees evergreen, up to 30 m tall, to 60 cm d.b.h. One-year-old branchlets red-brown, terete, 5-6 mm in diam., glabrous, with longitudinally fissured elevated corky and oblong lenticels and large suborbicular leaf scars; current year branchlets reddish, subterete, usually short, 4-10 cm, 4-5 mm in diam., glabrous, with densely clustered annular scale scars at base. Terminal buds large, ovoid, up to 2.5 cm; bud scales broadly ovate or suborbicular, apiculate at apex, always glabrous, except basal ones densely yellowish brown pubescent outside and on margin, densely imbricate. Leaves alternate, remote; petiole reddish, (1.7-)2-5 cm, plano-convex, glabrous; leaf blade greenish abaxially, green adaxially, oblong, 9-20 × 2.5-5.7 cm, subleathery, glabrous on both surfaces, midrib straight, extending to leaf apex, very elevated abaxially, slightly impressed on lower part but nearly plane on upper part adaxially, lateral veins ca. 12 pairs, arcuate, interconnected and evanescent near leaf margin, transverse veins and veinlets reticulate, slightly foveolate abaxially, inconspicuous adaxially, base cuneate or broadly cuneate, sometimes slightly oblique on one side, margin slightly involute, apex shortly acuminate. Flowers unknown. Infructescence paniculate, short, 5-8.5 cm, inserted on lower part of branchlet, only with 1 well-developed fruit; rachis reddish, glabrous. Fruit red, ellipsoid, up to 5 × 3 cm, glabrous; fruit stalk robust, ca. 5 mm, fleshy, ca. 4 mm in diam. on top, glabrous.

● Evergreen broad-leaved forests on limestone mountains; 1300-1500 m. SE Yunnan.