The paper presents the findings of investigations into Middle Jurassic communities with fossil plants of Phoenicopsis genus. The classification of phytooryctocoenoses has been developed based on tafonomic peculiarities and abundance of species. A supposed structure and ecology of parental communities are reconstructed from the obtained classification. For the first time the prodromus of marsh fossil vegetation composed of three associations belonging to Phoenicopsietea genus is described. The detailed diagnoses of parasyntaxones are given.