FLORA OF VIETNAM Rubiaceae Myrioneuron tonkinense Pit.
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.
Edges or in open places of heavily logged primary evergreen broad-leaved forests on foot of limestone mts. Perennial herb, 0.5 m tall. Flowers yellow. Rare.