Dien Bien Prov., Muong Cha Distr., Hua Ngai Municipality, Ha La Chu Village, around point 21°53′46”N 103°10′17”E.
Highly degraded primary evergreen broadleaved humid forest on very steep slopes of remnant mountains composed with solid limestone at elevation 1100-1400 m a.s.l.
Herbaceous vine to 6 m long on open mossy rocky outcrops. Flowers white, disc blue anthers and stigmas light greenish. Rare.