There are several protected plant species to be found in Glenveagh including Killarney Fern (Trichomanes speciosum) which is legally protected under the Flora (Protection) Order, 1999, and listed on Annex II of the E.U. Habitats Directive.
Other rare species that are found in Glenveagh that are also protected under the Flora (Protection) Order, 1999, include the Small-white Orchid (Pseudorchis albida) and Heath Cudweed (Omalotheca sylvatica).
Many scarce plants have been recorded from cliffs and gullies, mainly around Slieve Snaght and the Poisoned Glen area. These include Brittle Bladder-fern (Cystopteris fragilis), Alpine Clubmoss (Diphasiastrum alpinum), Stiff Sedge (Carex bigelowii), Mountain Sorrel (Oxyria digyna) and Irish Spurge (Euphorbia hyberna). Purple Saxifrage (Saxifraga oppositifolia) and Alpine Saw-wort (Saussurea alpina) have also been recorded from this area.