Marker 7Fabre and Flahault pursued two objectives: studying the way certain forest species adapt to the Cevenol climate and studying plants in their relationship with environmental conditions. Some plant species are better adapted than others to the Cevenol climate. Thus, Mediterranean and Douglas firs do very well, as do almost all the species native to Europe, Asia Minor and the western United States. Species from East Asia and the eastern United States, however, whither away. Through his work, Flahault laid the foundations of phytosociology, the study of how plants arrange themselves into communities as a function of the environmental conditions.