Terrestrial habitats in the area of Una National Park are the meadows, pastures and forests. Most of the National Park area is covered with different types of forests, climazonal as well as extrazonal and azonal. Grasslands of the National Park represent the anthropogenic permanent stages, and can be maintained only by continuous indirect (grazing) or direct (mowing), human influence. The area abounds with limestone cliffs inhabited by cracking plants (hazmofitske).
Below the large rocky hills, under the influence of the hydrosphere and atmosphere, parts of rocks are breaking off, rolling down the slope, in that way creating sporadic screes (sandbanks). At higher elevations above the canyon itself, at the flattened terrain with deeper tiny soil, lawns from the Brometalia erecta line are developed ccasionally. Aquatic habitats include the area of the river Una and Unac. The river Una and Unac don't have a developed water macrophyte vegetation in the area of research, but only sporadically, in small quiet lagoons, some macrophyte species, may occasionally be found.
Out of the wetlands at the observed field, wet and marshy grasslands, green and high reed-patches, are represented.At the area along the river Una, hygrophilous community of forests and shrubs of willow, alder and osier, are developed. Habitats on travertine waterfalls with their specific ecological conditions, represent a particular biotope, which is significantly different from all other habitats in fresh water. Except for higher plants and diatoms, 42 species of plants and that is 25 species of algae and 17 species of moss, were found on waterfalls in total. All these plants are involved in building the travertine formations, except for 2 species of hepatics. Most are therefore porophyte, while only a small number are aporophyte.