Quang Binh Prov., Minh Hoa Distr., Thuong Hoa Comm., Ban On Vill., Pa Nun Valley, 17°40′22″N, 105°58′22″E, 250 m.
In rather open places of heavily logged primary evergreen broad-leaved forests on foot of limestone mts. Perrenial herb, up to 1 m tall. Spadice white. Rare.