Hoa Binh Prov., Lac Son Distr., Ngoc Son Municipality, Khu Village, Bua Coi Mt., around point 20°27’17”N 105°18’52”E. In heavily logged closed primary evergreen broad-leaved forest on slopes of limestone mts., at elevation about 600-650 m a.s.l. Terrestrial, wet and rather open places, ca. 2-3 m tall. Occasional common.