N. Vietnam, prov. Cao Bang, distr. Bao Lac, municipality Yen Lac,. vicinities of Yen Lac village (N 22°44' E 105°50'). Primary mixed. semideciduous forest (with domination Keteleeria chinensis) along tops. of remnant karst limestone ridge at 1450-1500 m elev. Terrestrial and. lithophyte herb in shady places. Flowers light blue-violet. Common. No CBL 1472 16 April 1999. International Botanical Expedition of the U.S.A. National Geographic. Society (grant No 6300-98). Collectors: P.K.Loc, P.H.Hoang, Averyanov L.
Coordinates (geographic position):22° 44′ N, 105° 50′ E ±1000 mRecord creation: 2019-02-22, Leonid Averyanov, PhotoScan D1. Processing status: work_status_1Citation: Specimen LE 01049351 // Virtual herbarium of Komarov Botanical Institute RAS — http://re.herbariumle.ru/01049351