Description from
Flora of China
Astilbe rivularis var. angustata C. Y. Wu ex J. T. Pan.
Leaflets lanceolate or narrowly ovate to narrowly rhombic-obovate. Petals usually absent, sometimes 1 and obsolescent. Fl. and fr. Sep-Nov.
Forests, forest margins, ravines, by water; 1500-2800 m. NW Yunnan [N Myanmar].
