N. Vietnam, Prov. Hoa Binh, Distr. Mai Chau, subdistr. Pa Co, near 3 km to NE of Pa Co village. Rocks outcrops on secondary short tall grasslands of alluvial valley among limestone ridges at 1100 m alt.
Herb up to 1.5 m high. Flowers light violet. Not rare.
VH 2446 27.12.1995
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5094-93)
Participants: L. Averyanov, N.T. Ban, A. Budantzev, L. Budantzev, N.T. Hiep, D.D. Huyen, P.K. Loc, G. Yakovlev