Hoa Binh Prov., Lac Son Distr., Ngoc Son Municipality, Khu Village, Khu Na Mt., around point 20°26′43”N 105°19′57”E.
Edges of heavily logged closed primary and secondary evergreen broad-leaved forest on open and wet sites, especially along stream banks of limestone mts., at elevation about 530-650 m a.s.l.
Perennial herb or undershrub. Leaves brownish beneath. Occasional common.