长柱山丹 chang zhu shan dan

Mussaenda pavettifolia Kurz, Forest Fl. Burma 2: 57. 1877 ["pavettaefolia"]; Ixora pavettifolia (Kurz) Craib.

Erect shrubs to small trees, 1.5-6 m tall; branches slightly compressed, strigillose to strigose. Petiole 3-8 mm, strigillose; leaf blade drying membranous to papery, oblanceolate to obovate, elliptic, or elliptic-oblong, 7-25 × 3-8.5 cm, adaxially glabrous to puberulent, abaxially puberulent on blade and strigillose along veins, base cuneate to obtuse or rounded, apex acuminate; secondary veins 7-12 pairs; stipules ovate, 6-10 mm, strigillose to strigose, acuminate to shortly aristate. Inflorescence densely strigillose, hirsute, or strigose; peduncle 1-2.5 cm; branched portion 2-5 × 2.5-6 cm; bracts linear, 1.5-5 mm; pedicels 3-5 mm. Calyx densely hirsute to strigillose; ovary portion cylindrical to obconic, ca. 1 mm; limb with basal tubular portion 1-2 mm; lobes linear, 4-5 mm, acuminate. Corolla densely strigillose outside; tube 16-20 × 1.5-2 mm; lobes oblong-elliptic to elliptic or suborbicular, 4-5 mm, obtuse to rounded. Fruit 7-10 × 10-12 mm; pyrenes 5-6 × 5-6 mm, smooth to shallowly ridged. Fl. Apr-Jun, fr. Sep-Dec.

Broad-leaved forests at low to middle elevations; 100-1100 m. Guangxi, Hainan, Yunnan [Cambodia, Laos, Myanmar, Thailand, Vietnam].