Phu Tho Prov., Tan Son Distr., Xuan Son Municipality, Du village, Ten Mountain, around mountain top, point 21°06′49”N 104°56′03”E.
Primary broad-leaved evergreen forest on steep mountain slopes composed with shale at elevation 1100-1250 m a.s.l.
Terrestrial and lithophytic rosulate herb on very steep mossy rocky slopes and cliffs. Flowers light blue. Leaves dark green with light green spots. Very common around the mountain top.
HAL 12782 18 February 2009 Coll.: L.Averyanov, P.K.Loc, N.T.Vinh, L.T.Son.