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Slavonia is the most developed agricultural region in Croatia. With rich and fertile soils that have enabled the cultivation of a wide variety of fruits, vegetables, and cereals, Slavonia has always met the food needs of its population. Today, the biocultural diversity of local varieties and semi-natural vegetation has irretrievably disappeared. Our aim was to document the remaining local knowledge of plant use in this area through in-depth semi-structured interviews, which were conducted in 2022–2023. All possible aspects of the use of plants and fungi were recorded as food, animal feed, medicine, construction, jewelry, rituals and ceremonies, dyes, etc. The names and uses of local plant varieties were also recorded. The results show 1702 entries—a total of 296 plant taxa from 76 families and 28 fungi from 16 families. The most frequently named plants were: Urtica dioica, Robinia pseudoacacia, Rosa canina, and Sambucus nigra. The plants with the greatest variety of uses were Morus alba, Rosmarinus officinalis, Triticum aestivum, and Zea mays. Interesting uses were identified. The leaves of the ornamental plant Hosta sieboldiana are still used today as food for wrapping meat with rice, the aquatic plant Trapa natans is eaten like chestnuts, and Pteridium aquilinum was once consumed as a vegetable. In addition, Ambrosia artemisiifolia and Sambucus ebulus were given to horses to prevent and avoid blood poisoning. Some forest species had a special significance and were revered or favored. The most frequently mentioned edible fungi were Boletus sp., Cantharellus cibarius, and Lactarius piperatus. Auricularia auricula-judae is the only species stated to have been used exclusively as a raw snack. Evidence of edible use of Sarccoscypha coccinea, which was reported as traditionally consumed in the past, was of particular interest. Despite the modernization and agricultural nature of the region, many interesting uses of plants and fungi were identified. Further efforts should be directed towards documenting this knowledge to facilitate its dissemination in the communities that possess it, or at least to preserve it for future generations.

This study analyzed the use of plants and fungi, some wild and some cultivated, in three municipalities of Lika-Senj County (Perušić, Gospić and Lovinac). The range of the study area was about 60 km. Forty in-depth semi-structured interviews were performed. The use of 111 plant taxa from 50 plant families and five taxa of mushrooms and fungi belonging to five families was recorded (on average 27 taxa per interview). The results showed quite large differences between the three studied areas in terms of ethnobotanical and ecological knowledge. In the Perušić area, (101 taxa mentioned), some people still use wild plants on a daily basis for various purposes. The most commonly noted plants are Prunus spinosa, Taraxacum spp., Rosa canina, Urtica dioica, Juglans regia and Fragaria vesca. In the Lovinac region, people used fewer species of plants (76 species mentioned). The most common species used there are: Rosa canina, Achillea millefolium, Cornus mas, Crataegus monogyna, Sambucus nigra and Prunus domestica. In the town of Gospić, the collection and use of plants was not so widespread, with only 61 species mentioned, the most common being: Achillea millefolium, Cornus mas, Sambucus nigra, Viola sp., Prunus domestica and Rosa canina. The medicinal use of herbal tea Rubus caesius and Cydonia oblonga against diarrhea was well known in the study area and is used medicinally, mainly in the rural parts of the Gospić area. The consumption of the Sorbus species (S. aria, S. domestica and S. torminalis) is an interesting local tradition in Perušić and Lovinac. Species that are difficult to find in nature today and are no longer used include: Veratrum sp., Rhamnus alpinum ssp. fallax, Gentiana lutea and Ribes uva-crispa. The use of Chenopodium album has also died out. We can assume that the differences in ethnobotanical knowledge between the three studied areas are partly due to minor differences in climate and topography, while other causes lie in the higher degree of rurality and stronger ties to nature in the Lovinac and Perušić areas. The most important finding of the study is the use of the parasitic fungus Taphrina pruni (Fuckel) Tul. as a snack. The use of Helleborus dumetorum for ethnoveterinary practices is also worth noting. The traditional use of plants in the study area shows many signs of abandonment, and therefore efforts must be made to maintain the knowledge recorded in our study.

State boundaries limit human contacts in a homogenous context of a landscape and its natural features, including plants. After nine centuries of separation, finally the two territories in Slovenia share the same political history. In this paper we tried to answer the question to which extent the past political borders, geographical and cultural drivers affect today’s traditional knowledge on wild plants use of Slovenians, living unified in the same political entity. Data were collected using 60 in-depth semi-structured interviews, from March to August 2019, in two municipalities: Komen at Karst and Izola in Istria concerning food, medicinal, economic use, and local customs. The results indicate a quite large divergence in ethnobotanical and ecological knowledge between the two studied areas. In the Komen area, many people still use wild plants daily for various purposes (Taraxacum officinale, Melissa officinalis, Urtica dioica, Cornus mas, and Sambucus nigra). In contrast, this is limited to fewer people in the Izola area and mainly to seasonal use of specific plants (Asparagus acutifolius, Rosa canina, Salvia officinalis, Foeniculum vulgare and Rubus caesius). Unusual for the Mediterranean is the use of young shoots of Clematis vitalba, in the Izola area prepared as omelettes. We can assume that these differences are partly due to minor differences in climatic conditions and partly due to the influence of different cultures and cuisines. In the first place, the impact of Austro-Hungarian eating habits and cuisine can be seen on the area around Komen. Moreover, temporal “layers of knowledge” across the time scale are additionally mixed by the immigration of people from other parts of Slovenia or abroad, or with the influence of local herbal specialists. At last, we conclude Komen area knowledge is alive and homogeneous, and more connected to their local identity.