Quang Binh Prov., Minh Hoa Distr., Thuong Hoa Comm., Mo O O O Vill., Ruc Lan Valley, 17°40′52″N, 105°55′09″E, 260-270 m. Edges of primary and in secondary broad-leaved forests and woodlands regenerated on slash and burn abandoned areas from stream banks to foot of shale mts.
Shrub, up to 2-3 m tall; petals yellow. Occasionally common.