A special feature of the flora of the natural park are the communities of the fissures in the steep limestone cliffs in the Krka and Čikola River canyons, which include many rare and/or endemic plants.
Upstream from Roški slap, we find the community Moltkio-Campanuletum lepidae, composed of the Dalmatian endemic stone bellflower (Campanula lepida) and several Illyrian/Adriatic endemics: chimney bellflower (Campanula pyramidalis), mullein inula (Inula verbascifolia), Dalmatian pellitory (Tanacetum cinerarifolium), Illyrian iris (Iris illyrica), autumn crocus (Colchicum visianii), Adriatic violet (Viola adriatica), alyssum (Alyssoides sinuata), chervil (Chaerophyllum coloratum) and wolfen spurge (Euphorbia wulfenii). This community also often contains the maidenhair spleenwort (Asplenium trichomanes), scale fern (Ceterach officinarum), wall pellitory (Parietaria vulgaris) and common brighteyes (Reichardia picroides). Tufts of the endemic species rock moltkie (Moltkea petraea) are prominent on the rock cliffs in the Čikola canyon.
In the humid and shady travertine half-caves on the Krka River waterfalls, the moss community Eucladio-Adianthetum dominates, consisting of the lovely species southern maidenhair (Adiantum capillus-veneris).