Ha Giang Prov., Bac Me Distr., Phieng Luong municipality, around Phieng Luong village. Primary broad-leaved humid evergreen forest on very steep slopes and along rocky ridge composed with solid crystalline highly eroded limestone at elevation 1100-1150 m a.s.l. around point 22°38’07.1’’N 105°19’22.1’’E. Terrestrial herb to 1.5 m tall in wet place in alluvial slope at the bottom of limestone rocky hill. Flowers pink with purple venation. Occasional.