Clivia spp.
Coccinia grandis
Ivy Gourd
Cochlearia anglica
English Scurvygrass
Cochlearia danica
Danish Scurvygrass
Cochlearia officinalis
Common Scurvygrass
Cochlearia officinalis agg.
Scurvygrass
Coeloglossum viride
Frog Orchid
Coffea arabica
Coffee
Colchicum
Colchicum alpinum
Alpine Saffron
Colchicum autumnale
Meadow Saffron
Comarum palustre
Marsh Cinquefoil
Combretum indicum
Rangoon Creeper
Commelina benghalensis
Benghal Dayflower
Commelina diffusa
Climbing Dayflower
Commersonia bartramia
Conium maculatum
Hemlock
Conopodium majus
Pignut
Convallaria majalis
Lily-of-the-valley
Convolvulus arvensis
Field Bindweed
Corchorus aestuans
East Indian Jute Mallow
Corchorus olitorius
Jute Mallow
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 elegans
Stepladder Ginger
Costus guanaiensis
Spiral Ginger
Costus pictus
Painted Spiral Ginger
Cota tinctoria
Yellow Chamomile
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
Crepis biennis
Rough Hawk's-beard
Crepis capillaris
Smooth Hawk's-beard
Crepis foetida
Stinking Hawk's-beard
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 tommasinianus
Early Crocus
Crocus x luteus
Yellow Crocus
Crossandra infundibuliformis
Firecracker Flower
Crotalaria pallida
Crotalaria
Croton bonplandianus
Cruciata laevipes
Crosswort
Cucumis melo
Cantaloupe
Cucurbita pepo
Marrow
Cuphea carthagenensis
Colombian Waxweed
Cuphea hyssopifolia
False Heather
Cuscuta epithymum
Dodder
Cyanthillium cinereum
Little Ironweed
Cyclamen coum
Eastern Sowbread
Cyclamen hederifolium
Sowbread