A number of plant species which are otherwise scarce or absent in the Bristol region are found in high concentrations on the North Somerset Levels, including water horsetail (Equisetum fluviatile), rigid (Ceratophyllum demersum) and soft (C. submersum) hornworts, thread-leaved (Ranunculus trichophyllus), common (R. aquatilis) and fan-leaved (R. circinatus) water-crowfoots, lesser water-parsnip (Berula erecta), tubular (Oenanthe fistulosa) and fine-leaved (O. aquatica) water-dropworts, tufted forget-me-not (Myosotis laxa subsp. caespitosa), skullcap and fen bedstraw (Galium uliginosum).
The North Somerset Levels are home to a number of plant species that are uncommon or absent in the Bristol region, including water horsetail, rigid hornwort, soft hornwort, thread-leaved water crowfoot, common water crowfoot, fan-leaved water crowfoot, lesser water parsnip, tubular water dropwort, fine-leaved water dropwort, tufted forget-me-not, and skullcap and fen bedstraw.