FLORA OF VIETNAM Rubiaceae Ophiorrhiza sp. s.l.? Ha Giang prov., Quan Ba distr., Bat Dai Son Nature Reserve, Can Ty commune, Dau Cau 1 village, around point 23º05ʹ26.3ʺN 105º01ʹ03.0ʺE, 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.
Record creation: 2019-05-03, Leonid Averyanov, PhotoScan D1Citation: Specimen LE 01054416 // Virtual herbarium of Komarov Botanical Institute RAS — http://re.herbariumle.ru/01054416