Thanh Hoa Prov., Thuong Xuan Distr., Bat Mot Municipality, Vin village, Xuan Lien Natural Reserve.
Remnants of primary broad-leaved evergreen humid forest on rocky, highly eroded, crystalline limestone at elevation 750-800 m a.s.l. around point 19°59′11.4″N 104°58′31.8″E.
Terrestrial and lithophytic herb or undershrub to 2 m tall on very steep slopes along rocky stream. Flowers light blue-violet. Common.
1 November 2013 CPC 6423 L.Averyanov, N.T.Hiep, N.S.Khang