Son La Prov., Van Ho Distr., Chieng Xuan Municipality, Co Hong village, territory of Xuan Nha natural reserve, Pha Luong Mountain. Primary coniferous and mixed forest with Pinus cernua on very steep slopes along ridge edge composed by brown sandstone at elevation 1200-1400 m a.s.l. around point 20°41’40.5’’N 104°39’24.7’’E. Lithophytic and terrestrial undershrub on mossy very steep slopes and cliffs along ridge edge. Flowers pink, anther yellow. Locally common.