From Gelsemium elegans, G. sempervirens and G. rankinii, three new oxindole alkaloids. 19-(R)-hydroxydihydrogelsevirine, 19-(R)-acetyldihydrogelsevirine and 19-(R)-hydroxydihydrogelsemine, together with the known alkaloids 19-(S)-hydroxydihydrogelsevirine, gelsevirine and gelsemine were isolated. Their structures were determined by spectral analysis; the C-19 stereochemistry of 19-(R)-hydroxydihydrogelsevirine was established by single crystal X-ray analysis. © 1991.