Quang Binh Prov., Minh Hoa Distr., Thuong Hoa Comm., Ban On Vill., Con Moong mt. (about 1 km N on walking trail from Ban On to Thuong Hoa), 17°40′59″N, 105°57′56″E, 250-280 m.
On edges of heavily logged primary and secondary closed evergreen broad-leaved forests and woodlands on foot and lower part of slopes of limestone mts.
Perennial herb, ca. 0.3-0.4 m. Flowers ivory-yellowish. Rather common. Roots tuberous.