N. Vietnam, prov. Lao Cai, distr. Than Uyen, municipality Ho Mit (N 22°06′ E 103°52′). Elevation to Mang Han San quartzite peak by SW slope from Ban Thao village (SSW macroslope of Hoang Lien Son ridge). Secondary open forest on steep rocky slope at 1300-1400 m elev. Terrestrial forb up to 1.2 m hg on shady steep slope. Flowers white, central petal at the base with purple veins. Not rare.
NTH 2798 21-22 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)