Thanh Hoa Prov., Thuong Xuan Distr., Bat Mot Municipality, Vin village, Xuan Lien Natural Reserve.
Remnants of primary broad-leaved evergreen humid forest on rocky, highly eroded, crystalline limestone at elevation 750-800 m a.s.l. around point 19°59′11.4″N 104°58′31.8″E.
Herbaceous vine to 2 m long among open secondary shrubs on wet slopes of rocky stream. Flowers white. Common.
1 November 2013 CPC 6437 L.Averyanov, N.T.Hiep, N.S.Khang