Cao Bang Prov., Nguyen Binh Distr., Ca Thanh Municipality, Ta Pin village, around point 22°43'56.4"N, 105°51'16.4"E. Primary coniferous forest with Pseudotsuga sinensis along highly eroded rocky limestone ridge at elevation about 1400 m a.s.l. Terrestrial and lithophytic climbing vine-like unbranched herb with slender shoots to 2 m long on very steep mossy rocky shady slope. Rare.
Record creation: 2021-11-12, Leonid Averyanov, PhotoScan D2Citation: Specimen LE 01122765 // Virtual herbarium of Komarov Botanical Institute RAS — http://re.herbariumle.ru/01122765