Northern Vietnam, Lao Cai Prov., Van Ban Distr., Khanh Yen Ha municipality, to the SW of Na Nheo village (in the vicinity of point 21°57′15′'N, 104°12′39′'E). Primary broad-leaved evergreen montane forest along tops of granite/quartzite ridge at elev. 2400-2500 m a.s.l. Tree 5-7 m hg. Flowers purple, tube inside white, toward the base with deep purple spotting. Common at elev. 2500-2600 m a.s.l.