Cao Bang Prov., Bao Lac Distr., Dinh Phung municipality, Ban Meo village. Secondary broad-leaved evergreen forest on steep stream slope composed by shale stratified limestone at elevation 800-900 m a.s.l. around point 22°44’32.0’’N 105°46’29.1’’E. Terrestrial herb on shady wet stream rocks. Flowers yellow, wuth red marks inside. Rare.