Son La Prov., Moc Chau Distr., Chieng Son comm., Pha Luong village, Pha Luong Mountains. Open secondary forest on foothills of highly eroded red-brown sandstone mountains at elevation 1200-1300 m a.s.l. around point 20°41’33.2N 104°37’37.0E. Terrestrial herb in open sandy wet place along stream. Flowers orange, median tepal yellow. Very common.