FLORA OF VIETNAM
Rubiaceae
Spiradiclis karstana L. Wu, X. Li & Q.R. Liu

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. Erect lithophytic herb to 0.5 m tall on open rocky mountain top. Flowers purple. Occasional. 14 April 2018, L. Averyanov, Nguyen Sinh Khang, Chuong Quang Ngan, T. Maisak, VR 106 (HN, LE01054416).