Vientiane Prov., Kasi Distr., Thong Mout village, around point 19°25′19.7”N 102°08′32.7”E.
Primary broad-leaved evergreen forest on very steep slopes and on cliffs of remnant mountain composed with solid crystalline highly eroded limestone at elevation about 1550 m.
Terrestrial herb 1.5 m tall among shady rocks. Flowers white, median tepal with brightly red spot. Common.