Onagraceae Juss. Ludwigia octovalis (Jacquin) Raven subsp. sessiflora (Michaux) Raven S. Vietnam, Prov. Kontum. Evergreen primary forest along stream on N slope of Ngoc Linh mountain system at 1200-1300 m alt. Herb up to 0.5 m high in open places in the water of stream. Flowers yellow. VH 748 15.03.1995 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, L. Budantzev, N.T. Hiep, D.D. Huyen, P.K. Loc, N.X. Tam, G. Yakovlev