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617TAFRA, D. et al.: DENDROFLORA OMIA

Although only a small number of species brought into the culture has the ability to domesticate and spreadinvasively into the surrounding habitats, some of them can cause serious eco-system irregularities. In the re-gion of Omis especially dangerous could becomeAmorpha fruticosacovering more and more areas along theCetina river thus suppressing native species. Knowing that invasive species mainly domesticate and spreadthrough horticulture it is advisable to avoid them in horticulture.

Regarding geographical origins (able 2), the allochthonous dendroora of Omis is dominated by species from

Asia (65 taxa; 43.33 %), America (23.33 %) and Europe (12.80 %). Te most frequent Asian species in the hor-ticulture are those coming from China (Buddleja davidii, Kerria japonica, Rosa banksiaeetc).

Quite a significant number of woody species, autochthonous as well as allochthonous, and their high diversityattribute to an exceptional value of the dendroora of Omis.

Te research results relating to woody plants of the Omis and other Croatian regions indicate an unjustifiedlong-term neglect of autochthonous species in culture in comparison with the allochthonous ones even thoughthey have adjusted themselves to the existing climate conditions which makes the maintenance of horticul-tural objects easier, not to mention that their decorative qualities match those of the allochthonous species.

KEY WORDS: allochthonous and autochthonous dendroora, town of Omi