Son La Prov., Van Ho Distr., Tan Xuan comm., A Lay village, around point 20°40’46.2N 104°39’49.6E.
Secondary evergreen broad-leaved forest on very steep rocky slopes composed with red-brown sandstone and shale at elevation 1300-1500 m a.s.l. Creeping epiphytic vine 6-8 m long. Flowers white. Rare. 1 October 2016 CPC 8156 Photos