Rubiaceae

Ophiorrhiza sp.?

Ha Giang prov., Quan Ba distr., Bat Dai Son commune, Bat Dai Son Nature Reserve, San Chu village, around point 23º08ʹ55.1ʺN 104º59ʹ45.7ʺE, 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. Terrestrial erect herb to 1 m tall in rather shady place. Inflorescence rachis and flower buds pink. Occasional. 13 April 2018, L. Averyanov, Nguyen Sinh Khang, Chuong Quang Ngan, T. Maisak, VR 017 (HN).