The chemical investigation of three species of Parastrephia genus affo
rded: P. lucida:cinnamic acid, umbeliferone, esculetol, genkwanin, his
pidulin, gardenin B and apigenin-7,4-dimethylether. P. phyllicaeformis
: cumaric acid and 11-[p-cumaroyloxy]-tremetone. P. lepidophylla: 11-[
p-cumaroyloxy]-tremetone and 11-acetyloxy-tremetone. The structure of
these compounds were determinated by spectral analysis and by comparis
on with previously reported data.