坚髓杜茎山 jian sui du jing shan

Shrubs 1-4 m tall, reddish hirsute. Branchlets angular, longitudinally ridged; pith solid. Petiole canaliculate, 4(-10) mm; leaf blade elliptic to broadly obovate, 12-22 × 6-22 cm, papery, punctate, base broadly rounded to truncate or subcordate, sometimes asymmetric, margin coarsely serrate or serrate-dentate, apex long acuminate or caudate-acuminate, acumen 1-1.8 cm; lateral veins ca. 10 on each side of midrib, flat adaxially, hirsute, ending in noncallose teeth, submarginal vein absent. Inflorescences axillary, short racemose, 4-10 mm, hirsute throughout; bracts subulate, ca. 1 mm; bracteoles narrowly ovate, inserted up to middle of pedicel. Flowers ca. 2 mm. Pedicel 0.5-1 mm. Calyx lobes triangular-ovate, ca. 1.5 mm, as long as tube or longer, punctate-lineate. Corolla campanulate, ca. 2 mm; lobes 1/3-1/2 length of tube, subrounded, punctate-lineate. Stamens included, inserted at distal part of corolla tube; anthers broadly ovate, shorter than filaments. Pistil included. Style persistent; stigma lobed. Fruit globose, ca. 2 mm in diam., hirsute; persistent calyx lobes meeting at fruit apex. Fl. Mar, fr. Jul-Oct.

Dense evergreen broad-leaved forests, valleys, damp places; 900-1500 m. SE Yunnan [Vietnam]