Hoa Binh Prov., Tan Lac Distr., Ngo Luong Municipality, Tram Hai Village, Dong Xien mountainous range, ca. 1 km to S of coordinate ca. 20°28′15”N 105°17′21”E, locality of FPD no 3 of Ngoc Son-Ngo Luong NR.
In heavily logged evergreen broad-leaved woodland and scrub on slopes of limestone mts., at elevation about 750-800 m a.s.l. Perennial herb, ca. 0.5 m tall. All part of plants glabrous. Leaves peltate; flowers pinkish; fruits triangle in cross-section, elongate. Rare.