Tuyen Quang Prov., Na Hang Distr., Sinh Long municipality, Nam Duong village, Xo Lo Tre valley, around point 22°35′42.5″N, 105°20′58.8″E, 515 m a.s.l. In logged closed primary evergreen broad-leaved lowland forests on slopes of sandstone and shale mts. Terrestrial herb to 1 m heigh, labellum brightly orange, red- violet inside. CPC 4517 28 September 2011 Coll.: N.T.Hiep, N.S.Khang, P.V.The, N.T.Vinh