Ha Giang prov., Quan Ba distr., Tung Vai commune, Thang village, around point 23°03ʹ13.4ʺN 104°51ʹ48.8ʺE, at elevation 1050-1150 m a.s.l., steep slopes of stream valley composed with eroded stratified highly eroded limestone. Primary evergreen broad-leaved very humid forest. Treelet or shrub 3-4 m tall on rocky slope. Flowers red. Not common. 21 April 2018, L. Averyanov, Nguyen Sinh Khang, Nguyen Tien Hiep, Nguyen Quang Hieu, Chuong Quang Ngan, T. Maisak, VR 555 (HN, LE01049572).