云南无忧花 yun nan wu you hua

Trees, to 18 m tall. Petiolules robust, compressed, 4-6 mm; leaflets 4-6 pairs, oblong or obovate-oblong, 23-36 × 6.5-10 cm, papery, midvein robust, raised on both surfaces, lateral veins 11 or 12 pairs, base rounded or cuneate, apex rounded. In­florescence axillary, with crowded, short branches, forming nearly a sphere ca. 13 cm in diam. at anthesis; peduncles and rachis yellowish green puberulent; bracts and bracteoles persis­tent, ovate, equal in size, ca. 3 mm, ciliate, bracts spreading, bracteoles straight, enclosing pedicels. Flowers numerous, crowded, with long pedicels, articulate between calyx and apex of pedicels. Calyx tube shorter than pedicels, 1.5-1.8 cm; lobes ovate, ca. 1 cm, apex obtuse or slightly acute. Perfect stamens 4, ca. 3 mm; anthers subovoid, small, 1.5-1.8 mm. Ovary com­pressed, ca. 7 mm, thin, densely yellowish green puberulent; style ca. 2.8 cm; stigma small. Fruit not seen.

Dense or sparse forests, mountain slopes, along valleys, by streams; 300-1200 m. W Yunnan (Yingjiang) [Myanmar].