According to Blamey, Fitter and Fitter's (2003) Wild Flowers of Britain and Ireland, the following are listed as extinct:

• Creeping Spearwort (Ranunculus reptans)
• Pheasant's Eye (Adonis annua)
• Jagged Chickweed (Holosteum umbellatum)
• Boyd's Pearlwort (Sagina boydii)
• Corn-cockle (Agrostemma githago)
• Arctic Bramble (Rubus arcticus)
• Black Pea (Lathyrus niger)
• Hairy Spurge (Euphorbia villosa)
• Sussex Yellow Sorrel (Oxalis dillenii)
• Sickle Hare's Ear (Bupleurum falcatum)
• Thorow-wax (Bupleurum rotundifolium)
• Broad-leaved Centaury (Centaurium latifolium)
• Flax Dodder (Cuscuta epilinum)
• Downy Hemp-Nettle (Galeopsis segetum)
• Hemp Broomrape (Orobanche ramosa)
• Alpine Butterwort (Pinguicula alpina)
• Marsh Fleawort (Tephroseris palustris)
• Swine's Succory (Arnoseris minima)
• Summer Lady's tresses (Spiranthes aestivalis)
• Interrupted Brome (Bromus interruptus)
• Sharp Club-rush (Schoenoplectus pungens)
• Alpine Deergrass (Trichophorum hudsonianum)
• Bath Sedge (Carex davilliana)
• Rannoch Rush (Scheuchzeria palustris)