Clematis vitalba
Traveller's-joy
Cochlearia danica
Danish Scurvygrass
Cochlearia officinalis
Common Scurvygrass
Cochlearia officinalis agg.
Scurvygrass
Cocos nucifera
Coconut
Colchicum autumnale
Meadow Saffron
Conium maculatum
Hemlock
Conopodium majus
Pignut
Convallaria majalis
Lily-of-the-valley
Corylus avellana
Hazel
Cotoneaster horizontalis
Wall Cotoneaster
Cotoneaster integrifolius
Entire-leaved Cotoneaster
Cotoneaster melanocarpus
Black cotoneaster
Cotoneaster tomentosus
Cotoneaster (tomentosus)
Couroupita guianensis
Cannonball tree
Crataegus monogyna
Hawthorn
Crataegus rhipidophylla
Crepis foetida
Stinking Hawk's-beard
Crescentia cujete
Calabash Tree
Crithmum maritimum
Rock Samphire
Cryptomeria japonica
Japanese Red-cedar
Cuscuta europaea
Greater Dodder
Cynoglossum officinale
Hound's-tongue
Cyperus fuscus
Brown Galingale