Hoa Binh Prov., Tan Lac Distr., Ngo Luong Municipality, Tram Hai Village, ca. 500 m to S of 20°28′15”N 105°17′21”E.
Edges of heavily logged evergreen broad-leaved forest and woodland on slope of limestone mts., at elevation about 780-850 m a.s.l. Weed herb in just abandoned slash and burn areas.