Chara virgata
Delicate Stonewort
Chelidonium majus
Greater Celandine
Chenopodium vulvaria
Stinking Goosefoot
Chlorophytum orchidastrum
Orange Spider Plant
Chromolaena odorata
Devil Weed
Chrysophyllum cainito
Star Apple
Chrysosplenium alternifolium
Alternate-leaved Golden-saxifrage
Chrysosplenium oppositifolium
Opposite-leaved Golden-saxifrage
Chrysothemis pulchella
Sunset Bells
Cichorium intybus
Chicory
Circaea alpina
Alpine Enchanter's-nightshade
Circaea lutetiana
Enchanter's-nightshade
Circaea x intermedia
Upland Enchanter's-nightshade
Cirsium acaule
Dwarf Thistle
Cirsium dissectum
Meadow Thistle
Cirsium eriophorum
Woolly Thistle
Cirsium heterophyllum
Melancholy Thistle
Cirsium oleraceum
Cabbage Thistle
Cirsium palustre
Marsh Thistle
Cirsium vulgare
Spear Thistle
Cladium mariscus
Great Fen-sedge
Claytonia sibirica
Pink Purslane
Cleome rutidosperma
Fringed Spider Flower
Clerodendron chinensis
Glory Bower
Clerodendron paniculatum
Pagoda Flower
Clinopodium acinos
Basil Thyme
Clinopodium ascendens
Common Calamint
Clinopodium vulgare
Wild Basil
Clitoria ternatea
Asian Pigeonwings
Clivia spp.
Cnidoscolus aconitifolius
Chaya
Coccinia grandis
Ivy Gourd
Cochlearia danica
Danish Scurvygrass
Cochlearia officinalis
Common Scurvygrass
Codiaenum variegatum
Fire Croton
Coeloglossum viride
Frog Orchid
Colchicum autumnale
Meadow Saffron
Coleus amboinicus
Cuban Oregano
Coleus decurrens
Coleus
Coleus scutellarioides
Coleus
Comarum palustre
Marsh Cinquefoil
Commelina diffusa
Climbing Dayflower
Commersonia bartramia
Conium maculatum
Hemlock
Conocarpus erectus
Buttonwood
Conopodium majus
Pignut
Convallaria majalis
Lily-of-the-valley
Convolvulus arvensis
Field Bindweed
Corchorus aestuans
East Indian Jute Mallow
Corchorus olitorius
Jute Mallow
Cordyline fruticosa
Ti Plant
Cornus capitata
Bentham's Dogwood
Cornus sanguinea
Dogwood
Corylus avellana
Hazel
Costus guanaiensis
Spiral Ginger
Costus pictus
Painted Spiral Ginger
Cotoneaster cambricus
Wild Cotoneaster
Cotoneaster horizontalis
Wall Cotoneaster
Cotoneaster melanocarpus
Cotoneaster tomentosus
Cotoneaster (tomentosus)
Couroupita guianensis
Cannonball tree
Crassula helmsii
New Zealand Pigmyweed
Crataegus laevigata
Midland Hawthorn
Crepis capillaris
Smooth Hawk's-beard
Crossandra infundibuliformis
Firecracker Flower
Cruciata laevipes
Crosswort
Cryptogramma crispa
Parsley Fern
Cryptomeria japonica
Japanese Red-cedar
Ctenanthe setosa
Never Never Plant
Cuphea carthagenensis
Colombian Waxweed