Hoa Binh Prov., Tan Lac Distr., Ngo Luong municipality, Tram Hai village, around point 20°28’15”N 105°17’21”E. In heavily logged evergreen broad-leaved forest on slope of limestone mts., at elevation about 780-850 m a.s.l. Epiphyte on woody vine. Flowers purple. Rather common.