FLORA OF VIETNAM
Convallariaceae
Polygonatum mengtzense F.T. Wang & Tang

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. Lithophytic herb on mossy exposed rocks. Flowers white. Not rare. 19 April 2018, L. Averyanov, Nguyen Sinh Khang, Chuong Quang Ngan, T. Maisak, VR 448 (HN, LE01067219).