FLORA OF VIETNAM
Orchidaceae
Calanthe alleizettii Gagnep.

Ha Giang prov., Quan Ba distr., Bat Dai Son Nature Reserve, Thanh Van commune, Tan village, Thong (Conifer) Mountain, around point 23°07ʹ40.3ʺN 104°57ʹ11.2ʺE, at elevation 1000-1195 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. Terrestrial herb to 1 m tall on shady rocky slope. Flowers white, lip with brownish center. Not common. 19 April 2018, L. Averyanov, Nguyen Sinh Khang, Chuong Quang Ngan, T. Maisak, VR 502 (HN, LE01061421, LE01061422, LE01067179).