The Motovun forest in Istria is the last preserved pedunculate oak and narrow-leafed ash flood plain forest in Mediterranean region in Croatia. It has been phytocoenologically explored and described as a single forest community. The goal of the research is to phytocoenologically record stands in a special reserve of forest vegetation "Motovun Forest" based on the standard central European school (Braun-Blanquet, 1964) and to compare the researched stands. The field work included the creation of 20 releves at different locations. Ther were found 76 plant species in total and 27 species in average per releve. The results were analytically examined. The statistical analysis and the mutual comparison of floral composition were conducted. We have found that the Motovun forest can not include only one association, statistical analyzes showed breakdown of the three groups. Group releves no. 1 represent the wettest type of habitat within the Motovun forest, the most common plant species are from very humid areas and wetlands. As a differential species of plant stand out: Carex riparia, Rubus caesius, Cardamine pratensis, Lycopus europaeus, Rumex sanguineus, Galium palustre, Ranunculus repens, Leucojum aestivum and Valeriana dioica. Another group of releves represents the most abundant habitat type which occupies an intermediate position between the wet type 1 and the driest type 3. The differential plant species are Ligustrum vulgare, Rhamnus chatartica, Viburnum opulus and Circaea lutetiana. The third group of images represents the highest and driest habitats along with the old riverbed of the river Mirna. The differential plant species that stand out are: Vinca minor, Listera ovata, Symphytum tuberosum, Lamium galeobdolon, Arum italicum, Allium ursinum and Euphorbia amygdaloides. Based on statistical analysis of the ecologically-indicated values of certain plant species, we conclude that the group 1 is characterized by species that indicate heliophilous, warm and very humid habitat. Group 3 is characterized by sciophilous species of colder and drier habitats, while group 2 shows the transition conditions between them.