Ha Giang prov., Quan Ba distr., Bat Dai Son commune, Bat Dai Son Nature Reserve, San Chu village, around point 23°08ʹ55.1ʺN 104°59ʹ45.7ʺE, 1100-1290 m a.s.l., karstic, highly eroded mountains composed of solid marble-like limestone, primary evergreen coniferous humid forest with Pseudotsuga sinensis on rocky mountain tops and ridges. Lithophytic climbing or creeping shrub to 5 m long with stem to 10 cm in diam. on very steep rather open slope. Flowers purple, young leaves bright glossy reddish-pink. Not rare. 13 April 2018, L. Averyanov, Nguyen Sinh Khang, Chuong Quang Ngan, T. Maisak, VR 021 (HN, LE01054025, LE01054026, LE01067170).