phytosociology
/ˌfʌɪtəʊsəʊʃɪˈɒlədʒi/ /ˌfʌɪtəʊsəʊsɪˈɒlədʒi/noun
The branch of science which deals with plant communities, their composition and development, and the relationships between the species within them.
Origin
Early 20th century; earliest use found in Scientific Monthly. From phyto- + sociology.