Colchicum autumnale
Meadow Saffron
Colobanthus quitensis
Antarctic pearlwort
Comarum palustre
Marsh Cinquefoil
Conopodium majus
Pignut
Convallaria majalis
Lily-of-the-valley
Convolvulus arvensis
Field Bindweed
Cordyline australis
Cabbage-palm
Cornus capitata
Bentham's Dogwood
Corylus avellana
Hazel
Cotoneaster integrifolius
Entire-leaved Cotoneaster
Couroupita guianensis
Cannonball tree
Crassula helmsii
New Zealand Pigmyweed
Crataegus laevigata
Midland Hawthorn
Crataegus monogyna
Hawthorn
Crataegus rhipidophylla
Crepis foetida
Stinking Hawk's-beard
Crepis vesicaria
Beaked Hawk's-beard
Crithmum maritimum
Rock Samphire
Crocus nudiflorus
Autumn Crocus
Crocus tommasinianus
Early Crocus
Cruciata laevipes
Crosswort
Cryptogramma crispa
Parsley Fern
Cryptomeria japonica
Japanese Red-cedar
Cupressus nootkatensis
Nootka Cypress