Convolvulus arvensis
Field Bindweed
Corchorus aestuans
East Indian Jute Mallow
Corchorus olitorius
Jute Mallow
Cordyline australis
Cabbage-palm
Cordyline fruticosa
Ti Plant
Coreopsis lanceolata
Lanceleaf Coreopsis
Coriandrum sativum
Coriander
Cornus capitata
Bentham's Dogwood
Cornus sanguinea
Dogwood
Corrigiola litoralis
Strapwort
Corydalis solida
Bird-in-a-bush
Corylus avellana
Hazel
Cosmos caudatus
King's Salad
Cosmos Sulphureus
Sulfur Cosmos
Costus dubius
Spiral Flag
Costus elegans
Stepladder Ginger
Costus guanaiensis
Spiral Ginger
Costus pictus
Painted Spiral Ginger
Costus spiralis
Cota tinctoria
Yellow Chamomile
Cotoneaster cambricus
Wild Cotoneaster
Cotoneaster franchetii
Franchet's Cotoneaster
Cotoneaster horizontalis
Wall Cotoneaster
Cotoneaster integrifolius
Entire-leaved Cotoneaster
Cotoneaster melanocarpus
Cotoneaster tomentosus
Cotoneaster (tomentosus)
Couroupita guianensis
Cannonball tree
Crambe maritima
Sea-kale
Crassocephalum crepidioides
Redflower Ragleaf
Crassula helmsii
New Zealand Pigmyweed
Crataegus laevigata
Midland Hawthorn
Crataegus monogyna
Hawthorn
Crataegus rhipidophylla
Crateva religiosa
Sacred Garlic Pear
Crepis biennis
Rough Hawk's-beard
Crepis capillaris
Smooth Hawk's-beard
Crepis foetida
Stinking Hawk's-beard
Crepis vesicaria
Beaked Hawk's-beard
Crescentia cujete
Calabash Tree
Crinum asiaticum
Crinum (asiaticum#var#japonicum)
Crinum jagus
Saint Christopher's Lily
Crithmum maritimum
Rock Samphire
Crocosmia
Montbretia "Lucifer"
Crocosmia x crocosmiiflora
Montbretia
Crocus laevigatus
Crocus (laevigatus)
Crocus neapolitanus
Spring Crocus
Crocus nudiflorus
Autumn Crocus
Crocus sativus
Saffron Crocus
Crocus speciosus
Bieberstein's Crocus
Crocus tommasinianus
Early Crocus
Crocus x luteus
Yellow Crocus
Crossandra infundibuliformis
Firecracker Flower
Crossostephium chinense
Chinese Wormwood
Crotalaria pallida
Crotalaria
Croton bonplandianus
Cruciata laevipes
Crosswort
Cryptogramma crispa
Parsley Fern
Cryptomeria japonica
Japanese Red-cedar
Ctenanthe setosa
Never Never Plant
Cucumis melo
Cantaloupe
Cucumis sativus
Cucumber
Cucurbita pepo
Marrow
Cuphea carthagenensis
Colombian Waxweed
Cuphea hyssopifolia
False Heather
Cupressus nootkatensis
Nootka Cypress
Cupressus x leylandii
Leyland Cypress
Cuscuta epithymum
Dodder
Cuscuta europaea
Greater Dodder
Cyanthillium cinereum
Little Ironweed
Cyathea arborea
West Indian Treefern