FLORA OF VIETNAM
Rubiaceae
Xanthophytum polyanthum Pit.

Ha Giang prov., Quan Ba distr., Bat Dai Son Nature Reserve, Can Ty commune, Lung Vay village, around point 23°05ʹ46.7ʺN 105°02ʹ53.1ʺE, 1100-1280 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. Erect terrestrial and lithophytic herb to 1.5 m tall among shady rocks. Young flower buds light green. Occasional. 15 April 2018, L. Averyanov, Nguyen Sinh Khang, Chuong Quang Ngan, T. Maisak, VR 168 (HN, LE01058128, LE01067558).