Centaurium littorale
Seaside Centaury
Centaurium portense
Perennial Centaury
Centratherum punctatum
Cephalanthera damasonium
White Helleborine
Cerastium arvense
Field Mouse-ear
Cerastium semidecandrum
Little Mouse-ear
Cerastium tomentosum
Snow-in-summer
Cerastium x maureri
Ceratocapnos claviculata
Climbing Corydalis
Chaenorhinum minus
Small Toadflax
Chaenorhinum origanifolium
Malling Toadflax
Chamaenerion angustifolium
Chelidonium majus
Greater Celandine
Chenopodium album
Fat-hen
Chenopodium vulvaria
Stinking Goosefoot
Chloris barbata
Swollen Windmill-grass
Chromolaena odorata
Devil Weed
Chrysosplenium alternifolium
Alternate-leaved Golden-saxifrage
Chrysosplenium oppositifolium
Opposite-leaved Golden-saxifrage
Cichorium intybus
Chicory
Circaea alpina
Alpine Enchanter's-nightshade
Circaea x intermedia
Upland Enchanter's-nightshade
Cirsium arvense
Creeping Thistle
Cirsium dissectum
Meadow Thistle