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. Leave violet beneath,Flowers white. pale -violet . On rock, in shady place, common HLF 565. 21 Dec. 2002.
Coll. Nguyen Tien Hiep, Jacinto Regalado, Duong Van Xy, Bang Tien Sy Grant from Henry Luce Foundation.