Gesneriaceae Dumort. Slackia tonkinensis Pell. S. Vietnam, Prov. Kontum. N slopes of Ngoc Linh mountain system. Cloud evegreen primary forest at 2400-2450 m alt. with abundance of Bryophytes. Herb up to 0.2 m high. Flowers light violet. Vory common, often dominant. VH 533 06.03.1995 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5094-93)
Participants: L. Averyanov, N.T. Ban, N. Q. Binh, A. Budantzev, L. Budantzev, N.T. Hiep, D.D. Huyen, P.K. Loc, N.X. Tam, G. Yakovlev