Quang Binh Prov., Minh Hoa Distr., Thuong Hoa Comm., Ban On Vill., Pa Nun Valley, at point 17°40′22″N, 105°58′22″E, 250 m.
In rather open places of heavily logged primary, sometimes in secondary closed evergreen broad-leaved forests on foot and lower part of slopes of limestone mts.
Perennial herb, up to 0.6-0.8 m tall. Sepals purple, petals and anthers white. Rather common.