Quang Nam Prov., Dong Giang Distr., Ma Cooih Municipality around point 15°58′11”N 107°40′15”E.
Remnants of primary closed evergreen broad-leaved forests on very steep slopes of hill composed with solid highly eroded limestone at elevation 450-500 m a.s.l.
Terrestrial herb on steep shady slope. Flowers dark dirty purple-violet. Locally very common.
HAL 12116 9 January 2009 Coll.: L.Averyanov, P.K.Loc, P.V.The, N.T.Vinh