N.Vietnam, Bac Kan Prov., Ba Be Distr., Nam Mau Municipality Nam Dai village, Ba Be National Park around point 22025′ 651′'N 1050 35′ 613′'E. Primary closed evergreen broad-leaved forest on top of remnant mountains composed with crystalline highly eroded marble-like limestone at elevation 704 m a.s.l with dominant of Nghien (Burretiodendron). Herb 10-30 cm hight. Leaves violet beneath.Flowers white. On rock, in shady place, common HLF 564. 21 Dec. 2002.
Coll. Nguyen Tien Hiep, Jacinto Regalado, Duong Van Xy, Bang Tien Sy Grant from Henry Luce Foundation.