Campanula rotundifolia
Harebell
Campanula trachelium
Nettle-leaved Bellflower
Cantharanthus roseus
Pink Periwinkle
Capsella bursa-pastoris
Shepherd's-purse
Capsicum annum
Sweet Pepper
Capsicum frutescens
Guinea Pepper
Cardamine corymbosa
New Zealand Bitter-cress
Cardamine flexuosa
Wavy Bitter-cress
Cardamine hirsuta
Hairy Bitter-cress
Cardamine impatiens
Narrow-leaved Bitter-cress
Cardamine occulta
Cryptic Bittercress
Cardamine pratensis
Cuckooflower
Cardamine quinquefolia
Whorled Coralroot
Cardiocrinum giganteum
Cardiospermum halicacabum
Lesser Balloon Vine
Carduus crispus
Welted Thistle
Carduus nutans
Musk Thistle
Carduus tenuiflorus
Slender Thistle
Carissa macrocarpa
Natal Plum
Carlina vulgaris
Carline Thistle
Carpinus betulus
Hornbeam
Carpobrotus edulis
Hottentot-fig
Carum carvi
Caraway
Caryota mitis
Fishtail palm
Cascabela thevetia
Yellow Oleander
Cassia artemisioides
Feathery Cassia
Cassia fistula
Golden Shower Tree
Castanea sativa
Sweet Chestnut
Castilla elastica
Panama Rubber Tree
Casuarina equisetifolia
Coastal She-oak
Causonis trifolia
Bush Grape
Ceanothus dentatus
Ceanothus
Ceanothus sp.
Ceanothus
Ceanothus thyrsiflorus
Creeping Blueblossom
Cedrus atlantica
Atlas Cedar
Cedrus deodara
Deodar
Cedrus libani
Cedar-of-Lebanon
Celosia argentea
Silver Cock's Comb
Centaurea cyanus
Cornflower
Centaurea debeauxii
Slender Knapweed
Centaurea montana
Perennial Cornflower
Centaurea nigra
Common Knapweed
Centaurea scabiosa
Greater Knapweed
Centaurium erythraea
Common Centaury
Centaurium littorale
Seaside Centaury
Centaurium portense
Perennial Centaury
Centaurium pulchellum
Lesser Centaury
Centaurium scilloides
Perennial Centaury
Centranthus ruber
Red Valerian
Centratherum punctatum
Brazilian bachelor's button
Centrosema pubescens
Butterfly Pea
Cephalanthera damasonium
White Helleborine
Cephalanthera longifolia
Narrow-leaved Helleborine
Cephalanthera rubra
Red Helleborine
Cerastium alpinum
Alpine Mouse-ear
Cerastium arvense
Field Mouse-ear
Cerastium diffusum
Sea Mouse-ear
Cerastium fontanum
Common Mouse-ear
Cerastium glomeratum
Sticky Mouse-ear
Cerastium pumilum
Dwarf Mouse-ear
Cerastium semidecandrum
Little Mouse-ear
Cerastium tomentosum
Snow-in-summer
Cerastium x maureri
Ceratocapnos claviculata
Climbing Corydalis
Ceratophyllum demersum
Rigid Hornwort
Ceratostigma plumbaginoides
Plumbago
Cercidiphyllum japonicum
Katsura
Cercis siliquastrum
Judas-tree
Cereus hexagonus
Lady of the Night Cactus
Cestrum nocturnum
Night-blooming Jessamine