FLORA OF VIETNAM
Orchidaceae
Thrixspermum calceolus (Lindl.) Rchb.f.

Ha Giang prov., Quan Ba distr., Bat Dai Son Nature Reserve, Bat Dai Son commune, Pai Chu Phin village, around point 23°07ʹ54.9ʺN 104°59ʹ24.1ʺE, 1000-1220 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. Erect undershrub to 0.5 m tall on rocky mountain top. Not common. 16 April 2018, L. Averyanov, Nguyen Sinh Khang, Chuong Quang Ngan, T. Maisak, VR 311 (HN, LE01054267).