Thanh Hoa Prov., Thuong Xuan Distr., Bat Mot Municipality, Vin village, Xuan Lien Natural Reserve.
Open secondary broad-leaved evergreen forest on alluvial valley along stream between rocky limestone hills at elevation about 800 m a.s.l. around point 20°00′00.4″N 104°59′00.7″E.
Semi-woody vine 4-6 m long on open limestone boulders. Flowers punk-purple. Occasional.
2 November 2013 CPC 6552 L.Averyanov, N.T.Hiep, N.S.Khang Photo