phy·to·so·ci·ol·o·gy 
(fī′tō-sō′sē-ŏlə-jē, -shē-)
(fī′tō-sō′sē-ŏlə-jē, -shē-)n.
The branch of ecology that deals with the characteristics, classification, relationships, and distribution of plant communities.
phy′to·so′ci·o·logi·cal (-sō′sē-ə-lŏjĭ-kəl, -shē-) adj.
phy′to·so′ci·o·logi·cal·ly adv.
phy′to·so′ci·olo·gist n.