Crataegus laevigata
Midland Hawthorn
Crataegus monogyna
Hawthorn
Crepis capillaris
Smooth Hawk's-beard
Crithmum maritimum
Rock Samphire
Crocosmia x crocosmiiflora
Montbretia
Crocus laevigatus
Crocus (laevigatus)
Crocus neapolitanus
Spring Crocus
Crocus sativus
Saffron Crocus
Crocus tommasinianus
Early Crocus
Crossandra infundibuliformis
Firecracker Flower
Crotalaria pallida
Crotalaria
Cruciata laevipes
Crosswort
Cryptogramma crispa
Parsley Fern
Cuphea hyssopifolia
False Heather
Cuscuta epithymum
Dodder
Cyclamen hederifolium
Sowbread
Cydonia oblonga
Quince
Cygnus olor
Mute Swan
Cymbalaria muralis
Ivy-leaved Toadflax
Cymbidium ensifolium
Four-season Orchid
Cynoglossum officinale
Hound's-tongue
Cynosurus cristatus
Crested Dog's-tail
Cyperus brevifolia
Cypripedium calceolus
Lady's-slipper