FLORA OF VIETNAM Zingiberaceae Costus tonkinensis Gagnep.
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. Perennial herb, ca. 2-3 m tall; flowers yellowish. Common.