Centaurium portense
Perennial Centaury
Centratherum punctatum
Brazilian bachelor's button
Cephalanthera damasonium
White Helleborine
Cerastium fontanum
Common Mouse-ear
Cerastium semidecandrum
Little Mouse-ear
Ceratocapnos claviculata
Climbing Corydalis
Ceratophyllum demersum
Rigid Hornwort
Ceratostigma plumbaginoides
Cercidiphyllum japonicum
Katsura
Chaenorhinum minus
Small Toadflax
Chaenorhinum origanifolium
Malling Toadflax
Chaerophyllum temulum
Rough Chervil
Chamaecyparis lawsoniana
Lawson's Cypress
Chamaecyparis obtusa
Hinoki Cypress
Chamaenerion angustifolium
Rosebay Willowherb
Chara virgata
Delicate Stonewort
Chelidonium majus
Greater Celandine
Chenopodium vulvaria
Stinking Goosefoot
Chlorophytum orchidastrum
Orange Spider Plant
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