Cao Bang Prov., Bao Lac Distr., Hong An municipality, Mi Lung village.
Primary mixed and coniferous humid evergreen forest (with Podocarpus, Fokienia and Tsuga) on very steep slopes and along rocky ridge composed with solid crystalline highly eroded limestone at elevation about 1400 m a.s.l. around point 22°48′45.9″N 105°51′10.8″E.
Terrestrial and lithophytic herb up to 0.5 m tall in shady wet place on mountain slope. Flowers dark violet. Common.