phytosociology

noun

phy·​to·​so·​ci·​ol·​o·​gy ˌfī-tō-ˌsō-sē-ˈä-lə-jē 

-shē-

: a branch of ecology concerned especially with the structure, composition, and interrelationships of plant communities

phytosociological

ˌfī-tō-ˌsō-sē-ə-ˈlä-ji-kəl 

-shē-

adjective

Word History

Etymology

phyto- + sociology

First Known Use

1917, in the meaning defined above