Quang Nam Prov., Dai Loc Distr., Dai Hong municipality, environs of Dai Hong town around point 15°49’19”N 107°56’58”E. Rich secondary broadleaved evergreen forest on very steep rocky slopes and cliffs composed with eroded sandstone at elev. about 400 m a.s.l. Terrestrial herb on shady slope. Tepals green, lip white with red-purple nerves. Not common.