Gustave Planchon

François Gustave Planchon (October 29, 1833 – April 13, 1900) was a French pharmacist, paleontologist, and botanist.

Planchon was born in Ganges, Hérault, the son of candle manufacturer David and Marie Coularou.

He served as a professeur agrégé for two years and then wrote another thesis on the tufas of the quaternary in Montpellier and the changing flora of the region.

In 1872 he became chair of natural history of drugs and stayed in the position until his death.

In 1875 he wrote a paper on the botany of jaborandi, a plant in the genus Pilocarpus that had become medically of interest for its ability to induce intense sweating and reduce vascular pressure.