Ha Giang prov., Quan Ba distr., Bat Dai Son Nature Reserve, Can Ty commune, Dau Cau 1 village, around point 23°05ʹ26.3ʺN 105°01ʹ03.0ʺE, 1100-1150 m a.s.l., karstic, highly eroded mountains composed of solid marble-like limestone, primary evergreen broad-leaved humid forest on steep rocky slopes near mountain tops. Herbaceous vine to 4 m long in rather open place. Flowers white with purple-violet tint. Not rare. 14 April 2018, L. Averyanov, Nguyen Sinh Khang, Chuong Quang Ngan, T. Maisak, VR 127 (HN, LE01054442). Det.: A. Sennikov 12.09.2019, Blumea megacephala C.T. Chang & C.H. Yu (= Blumea riparia DC. var. megacephala Randeria) Det.: I. Illarionova 17.10.2019.