Durham Rare Plant Register - Botanical Society of the British Isles

Locally Scarce Species75 probably-native species, recorded since 1961.These species occur in less than half of one percent of the kilometre squaresof the county, that is, fifteen or less sites.The number of sites for these species is defined as a “Wells Site”, asexplained above.These are the species that are of local importance, for example in thedesignation of Local Wildlife Sites.This list will be refined for the second edition of the Register, and the criterionfor inclusion will probably be reduced to 10 or less sites.Scientific Name English Name Number of sitesand notes.Aphanes australis Slender Parsley-piert 13Apium inundatum Fool’s Water Cress 6Arctostaphyllos uva-ursi Bear Berry 5Asplenium ceterach Rustyback 8Asplenium marinum Sea Spleenwort 7Asplenium trichomanesDelicate Maidenhair4trichomanesSpleenwortAtriplex laciniata Frosted Orache 11Berula erecta Lesser Water-parsnip 15Bromus commutatus/racemosus Smooth Brome 4Butomus umbellatus Flowering Rush 8Calamintha sylvatica ascendens Calamint 3Callitriche hermaphroditica Autumnal Water-starwort 3Carex bigellowii Stiff Sedge 11Carex pseudocyperus Cyperus Sedge 5Catapodium marinum Sea Fern-grass 10Centaurium pulchellum Lesser Centaury 4Ceratophyllum demersum Rigid Hornwort 15Clinopodium acinos Basil Thyme 8Coronopus squamatus Swine Cress 15Cryptogramma crispa Parsley Fern 14Diphasiastrum alpinum Alpine Clubmoss 6Dryopteris oreades Mountain Male Fern 13Eleocharis quinqueflora Few-flowered Spike-rush 11Epilobium alsinifolium Chickweed Willowherb 10Eriophorum latifolium Broad-leaved Cottongrass 11Festuca altissima Wood Fescue 9Festuca junceifolia Rush-leaved Fescue 15Festuca vivipara Viviparous Fescue 15Filago minima Small Cudweed 9Filipendula vulgaris Dropwort 4Gentianella campestris Field Gentian 10Geranium pusillum Small-flowered Cranesbill 8Helleborus viridis Green Hellebore 15