In the present paper, the differences and similarities among three Pinus pinea littoral forests occurring in three geographically and bioclimatically different areas of Greece are examined with the use of floristic (syntaxonomical), numerical and pattern recognition techniques. The three study sites are located in Strofilia forest (south-west Peloponnese), Schinias forest (Attiki), and 'Koukounaries' forest (Skiathos Island) and present a similar 'pattern'. Thorough sampling of the forest flora, by using the Domin scale of abundance, and vegetation sampling were performed for the sites. The sites' flora was then classified into chorological and life-form classes. Vegetation units identification and further syntaxonomical classification of sites' vegetation was done by using TWINSPAN software. Finally, we compared site observations and measurements using several classic similarity and distance criteria, a process aided by Noesis, a pattern recognition software tool designed for signal analysis and industrial data applications. The flora of the three littoral forests expresses a strong Mediterranean character. Five forest habitat types were distinguished according to the Natura 2000 habitat interpretation manual, two of which are priority habitats. Similarities and differences between the flora and vegetation of the three sites were recorded, and a statistical approach was used to measure the degree of similarity between the three protected sites. Conclusions on the ecological status of the three sites were drawn by the combination of these measuring methods.