云南油丹 yun nan you dan

Trees small. Old branchlets gray, shiny, robust, bark longitudinally fissured, with many brown elliptic lenticels; young branchlets slender, lenticellate. Leaves clustered at apex of branchlet, uppermost ones always subopposite; petiole slightly slender, 1-2 cm, concave-convex; leaf blade slightly shiny, oblong, 11-19 × 4.5-6 cm, papery, glabrous and densely finely foveolate on both surfaces, midrib elevated abaxially, impressed adaxially, lateral veins 9-11 pairs, elevated abaxially, inconspicuous adaxially, oblique, sometimes forked, arcuate and interconnected at ends, base broadly cuneate and attenuate into petiole, apex acute or acuminate. Panicle axillary, 2-3(-4) cm, few flowered, brown pilose, unbranched or shortly branched; peduncle 1-3.5 cm. Pedicel slender, 5-8 mm, glabrous. Perianth lobes 6, glabrous outside, densely brownish pilose inside, outer ones ovate, ca. 3 × 1.5 mm, acute, inner ones broadly ovate, ca. 3.5 × 2 mm, acute. Fertile stamens 9; filaments of 1st and 2nd whorls almost as long as anthers, glandless, those of 3rd whorl each with 2 large glands; anthers of 1st and 2nd whorls broadly elliptic, ca. 0.75 mm, with introrse cells, those of 3rd whorl slightly narrower, truncate at apex, with lateral cells. Staminodes conspicuous, sagittate, ca. 1.3 mm, stalked. Ovary subglobose, ca. 2.5 mm, glabrous; style short, ca. 0.5 mm; stigma discoid, inconspicuous. Fruit unknown. Fl. Apr.

● Shady rocky places in valleys; ca. 800 m. SE Yunnan.