FLORA OF VIETNAM
Rubiaceae
Leptodermis coriaceifolia Tao Chen

Ha Giang prov., Quan Ba distr., Bat Dai Son Nature Reserve, Thanh Van commune, Tan village, Thong (Conifer) Mountain, around point 23°07ʹ40.3ʺN 104°57ʹ11.2ʺE, at elevation 1000-1195 m a.s.l., karstic, highly eroded mountains composed of solid marble-like limestone, primary evergreen broad-leaved and coniferous (with Pseudotsuga sinensis) humid forest on steep rocky slopes near mountain tops. Shrub to 3 m tall on exposed mossy rocks. Flowers white with violet tint. Very common on every mountain top. 19 April 2018, L. Averyanov, Nguyen Sinh Khang, Chuong Quang Ngan, T. Maisak, VR 478 (HN, LE01049600).