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The diversity of floristic communities of Monawilikin is a product of its limestone and at some points sandstone substrata. Typical plant species recorded in the calcareous grassland are kidney vetch, crested hair-grass, and wild thyme, alongside more locally distributed species such as Irish eyebright and blue moor-grass. Monawilkin has been listed for 24 vascular plants in the register of scarce or rare and extinct vascular plants. The scarce or rare plants are listed with their botanical name, their common name, and then the date they were last recorded: "Botrychium lunaria" (moonwort, 1985), "Juniperus communis", (common juniper, 2012), "Saxifraga hypnoides" (Mossy Saxifrage, 2013), "Rubus botryeros" (raspberry, blackberry family, 1904), "Lythrum portula" (water-purslane, 1985), "Primula veris" (cowslip, 1998), "Gentianella amarelle" (autumn gentian, 2012), "Gentianella campestris" (field gentian, 2012), "Plantago maritima" (sea plantain), "Euphrasia salisburgensis" (Irish eyebright, 1995), "Potamogeton praelongus" (long-stalked pondweed, 1988), "Potamogeton x salicifolius" (P. lucens x P. perfoliatus, Willow-leaved pondweed), "Neottia nidus-avis" (bird's-nest orchid, 1986), "Platanthera bifolia" (lesser butterfly orchid, 2013), "Platanthera chlorantha" (greater butterfly-orchid, 1985), "Pseudorchis albida" (small-white orchid, 1998), "Coeloglossum viride" (frog orchid, 1985), "Dactylorhiza incarnata ssp pulchella" (early marsh orchid, 2013), "Ophrys apifera" (bee orchid, 2012), "Carex distans" (distant sedge, 1987), "Agrostis vinealis" (brown bent), "Bromus racemosus" (smooth brome, 2012), "Inula helenium" (Elecampane, 2012), and "Doronicum pardalianches" (leopard's-bane, 1996) Vascular species found in Monawilin on the Northern Ireland priority species list include "Euphrasia salisburgensis" (Irish eyebright) and "Juniperus communis" (juniper). Those plants mentioned in the Irish Red Data Book include "Gentianella campestris" (field gentian), "Pseudorchis albida" (small-white orchid), "Neottia nidus-avis" (bird's nest orchid), and "Ophrys apifera" (bee orchid).