Common names: C
- cabbage
- cabbage palm
- cabbage rose
- cabbage thistle
- cabbage tree
- cacao
- cacao tree
- cactus dahlia
- cactus spurge
- Cairo morning glory
- calabash
- calabash gourd
- calamint
- calamondin
- calamus
- calico aster
- California arrowhead
- California brodiaea
- California privet
- Californian flannelbush
- Californian poppy
- Californian tree poppy
- calla
- Callery pear
- camellia
- Campbell's magnolia
- Camperdown elm
- camphor thyme
- camphor tree
- camphor-scented southernwood
- campion
- Canada bunchberry
- Canada goldenrod
- Canada mayflower
- Canada thistle
- Canadian burnet
- Canadian columbine
- Canadian lily-of-the-valley
- Canadian moonseed
- Canadian poplar
- Canadian vervain
- Canadian violet
- Canarian sage
- Canary Island bellflower
- Canary Island daisy
- Canary Island date palm
- Canary Island pine
- Canary Island spurge
- Canary Islands dragon tree
- Canary nasturtium
- cancer bush
- candelabra aloe
- candelabra primrose
- candelabra tree
- candy carrot
- candy corn vine
- candy flower
- candy mustard
- candytuft
- cannabis
- cannonball tree
- Canterbury bells
- cantuta
- Cape aloe
- Cape cowslip
- Cape daisy
- Cape figwort
- Cape flower
- Cape fuchsia
- Cape gooseberry
- Cape honeysuckle
- Cape jasmine
- Cape leadwort
- Cape Leeuwin wattle
- Cape lilac
- Cape mallow
- Cape marguerite
- Cape marigold
- Cape primrose
- Cape sundew
- caper plant
- Cappadocian navelwort
- carambola
- caraway
- cardinal climber
- cardinal flower
- cardoon
- Cardwell lily
- Caribbean agave
- Caribbean copper plant
- Caribbean royal palm
- caricature plant
- carline thistle
- Carmichael's monkshood
- carnival ochna
- carob tree
- Carolina rhododendron
- Carolina rose
- carpet bugle
- carrion flower
- carrion plant
- carrot
- carrotwood
- Cascades penstemon
- castor aralia
- castor oil plant
- cat's claw creeper
- cat's claw trumpet
- cat's whiskers
- Catawba rhododendron
- Catawba rosebay
- Cathay quince
- cathedral bells
- Catherine wheel pincushion
- catmint
- catnip
- catswort
- cattail
- Caucasian bladdernut
- Caucasian comfrey
- Caucasian cranesbil
- Caucasian cranesbill
- Caucasian crosswort
- Caucasian fir
- Caucasian lily
- Caucasian lime
- Caucasian peony
- Caucasian pincushion flower
- Caucasian speedwell
- Caucasian spruce
- Caucasian wingnut
- Caucasian zelkova
- cauliflower
- cedar
- cedar of Lebanon
- celandine
- celandine poppy
- Celebes pepper
- celeriac
- celery
- celery scented pelargonium
- celtuce
- cempedak
- cep
- cestrum
- Ceylon gooseberry
- chain fern
- chain plant
- chameleon plant
- Chamisso arnica
- Chamisso's bush lupin
- chamomile
- champion oak
- chanomile
- chaste tree
- checkerberry
- cheddar pink
- cheesewood
- Cherokee rose
- cherry
- cherry laurel
- cherry plum
- cherry prinsepia
- cherry tomato
- chervil
- chestnut
- chestnut dioon
- chestnut rose
- chicken of the woods
- chickweed
- chicory
- Chile lotus
- Chile pine
- Chile rhubarb
- Chilean avens
- Chilean bellflower
- Chilean bird's-foot trefoil
- Chilean cestrum
- Chilean firebush
- Chilean firetree
- Chilean holly
- Chilean lantern tree
- Chilean monkey flower
- Chilean myrtle
- Chilean nightshade
- Chilean potato vine
- Chilenian tarweed
- chili
- chili pepper
- China aster
- China fir
- China jute
- Chinese abelia
- Chinese angelica
- Chinese astilbe
- Chinese azalea
- Chinese bush berry
- Chinese cabbage
- Chinese celandine poppy
- Chinese chives
- Chinese cinnamom
- Chinese crab apple
- Chinese creeper
- Chinese daphne
- Chinese date
- Chinese dogwood
- Chinese evergreen
- Chinese evergreen oak
- Chinese fleecevine
- Chinese foxglove
- Chinese ginger
- Chinese globeflower
- Chinese glory bower
- Chinese hat plant
- Chinese hawthorn
- Chinese hibiscus
- Chinese hornbeam
- Chinese hound's tongue
- Chinese houses
- Chinese hydrangea
- Chinese indigo
- Chinese juniper
- Chinese lantern
- Chinese lilac
- Chinese maackia
- Chinese magnolia
- Chinese magnolia vine
- Chinese mahogany
- Chinese mallow
- Chinese meadow rue
- Chinese money plant
- Chinese mustard
- Chinese nutmeg-yew
- Chinese pearlbloom tree
- Chinese pearleaf crab apple
- Chinese peony
- Chinese pink
- Chinese plum
- Chinese plum tree
- Chinese prickly-ash
- Chinese quince
- Chinese ragwort
- Chinese red birch
- Chinese redbud
- Chinese rhubarb
- Chinese schisandra
- Chinese senna
- Chinese silk vine
- Chinese silver grass
- Chinese star anise
- Chinese sweet shrub
- Chinese trumpet vine
- Chinese tulip tree
- Chinese tupelo
- Chinese wax shrub
- Chinese white cabbage
- Chinese wild ginger
- Chinese winter hazel
- Chinese wisteria
- Chinese witch hazel
- Chinese wolfberry
- Chinese wolfsbane
- Chinese yellow banana
- Chir pine
- chives
- chocolate cosmos
- chocolate vine
- chokeberry
- chokecherry
- Christ plant
- Christmas cactus
- Christmas camellia
- Christmas rose
- christmas star
- chrysantha honeysuckle
- chrysanthemum
- Chusan palm
- cicer milkvetch
- cigar plant
- ciku
- cineraria
- cinnamom
- cinquefoil
- citron
- citronella grass
- citrus-yellow passion flower
- clammy cuphea
- Clarke's iris
- clary
- clary sage
- clasping heliotrope
- claw flower
- Clay's hibiscus
- clematis
- Cleveland's bush
- cliff bottlebrush
- climbing aloe
- climbing hydrangea
- climbing rose
- climbing snapdragon
- clove
- clove pink
- clover
- Clusius gentian
- cluster lily
- cluster mallow
- clustered bellflower
- clustered broom
- clustered fish tail palm
- clustered yellowtops
- clustertop vervain
- coast banksia
- coast beard heath
- coast black gooseberry
- coast blue blossom
- coast rosemary
- coast tarweed
- coastal tidy tips
- cobra lily
- cobweb houseleek
- cockleshell orchid
- cockscomb
- cockspur coral tree
- cockspur hawthorn
- cocoa tree
- Cocomilia plum
- coconut
- coconut tree
- coffee
- cohosh
- coleus
- collerette dahlia
- collorette dahlia
- colocynth
- Colorado blue columbine
- Colorado blue spruce
- Colorado fir
- Colorado pinyon
- coltsfoot
- columbine
- columnar apple
- columnar oak
- columnar pear
- comfrey
- comfrey-leaved rock rose
- common agrimony
- common alder
- common arrowhead
- common arum lily
- common ash
- common aspen
- common asphodel
- common ball flower
- common bamboo
- common barberry
- common beach grass
- common bean
- common beech
- common betony
- common bird's-foot-trefoil
- common bistort
- common bladderwort
- common blue violet
- common bog rosemary
- common boxwood
- common broom
- common buckwheat
- common bugleweed
- common bugloss
- common butterbur
- common butterfly bush
- common carline thistle
- common centaury
- common comfrey
- common corn cockle
- common cotton grass
- common daisy
- common dandelion
- common dogwood
- common duckweed
- common dyer's weed
- common elder
- common evening primrose
- common fan-flower
- common fig
- common flax
- common foxglove
- common fumitory
- common garden peony
- common glasswort
- common golden thistle
- common gooseberry
- common grape hyacinth
- common gromwell
- common hawthorn
- common hazel
- common heather
- common heliotrope
- common hibiscus
- common holly
- common hollyhock
- common honeysuckle
- common hop
- common horehound
- common hornbeam
- common horse chestnut
- common horsetail
- common hound's tongue
- common houseleek
- common hyacinth
- common ice plant
- common immortelle
- common indigo
- common ivy
- common juniper
- common laburnum
- common lavender
- common lilac
- common lime
- common lungwort
- common male fern
- common mallow
- common mare's tail
- common mayapple
- common milkweed
- common millet
- common monkey flower
- common monkshood
- common morning glory
- common mugwort
- common mulberry
- common myrtle
- common nightshade
- common ninebark
- common oak
- common orange lichen
- common osier
- common pasque flower
- common pear
- common pearl bush
- common peony
- common plane
- common plantain
- common polypody
- common privet
- common ragweed
- common ragwort
- common red stem fig
- common reed
- common rock rose
- common ruw
- common sage
- common service berry
- common silkweed
- common silverweed
- common sneezeweed
- common snowberry
- common snowdrop
- common soapwort
- common speedwell
- common spindle
- common spotted orchid
- common spruce
- common St. John's wort
- common star grass
- common sugarbush
- common sundew
- common sunflower
- common tansy
- common teasel
- common thistle
- common thyme
- common tobacco
- common toothwort
- common twayblade
- common valerian
- common verbena
- common vervain
- common vetch
- common walnut
- common wolfberry
- common wood sorrel
- common yarrow
- common yew
- common zinnia
- comon primrose
- compact burning bush
- compass plant
- cone flower
- coneflower
- Cook's pine
- Cooktown orchid
- Cootamundra wattle
- copper beech
- copper leaf
- coral bells
- coral pea
- coral peony
- coral reef araucaria
- coral tree
- coralberry
- coriander
- corkscrew flower
- corn
- corn chamomile
- corn cockle
- corn daisy
- corn marigold
- corn mint
- corn poppy
- cornelian cherry
- cornflower
- Cornish bellflower
- Cornish heath
- Cornish lily
- Corsican black pine
- Corsican heath
- Corsican hellebore
- Corsican violet
- cos lettuce
- Costa Rican nightshade
- Costa Rican skullcap
- cotoneaster
- cotton grass
- cotton thistle
- cow parsley
- cow parsnip
- cow vetch
- cowbane
- cowberry
- cowslip
- coyote willow
- crab apple
- crabapple
- crack willow
- cranberry
- cranberry hibiscus
- cranesbill
- cranesbill geranium
- crape ginger
- crape myrtle
- cream fruit
- creambush
- creeper
- creeping bellflower
- creeping dogwood
- creeping fescue
- creeping fuchsia
- creeping gloxinia
- creeping jenny
- creeping juniper
- creeping lily turf
- creeping marshwort
- creeping navelwort
- creeping phlox
- creeping saxifrage
- creeping speedwell
- creeping spurge
- creeping thistle
- creeping thyme
- creeping zinnia
- crepe gardenia
- crested anoda
- crested iris
- crested pickly poppy
- crested wattle
- Cretan arum
- Cretan calamint
- Cretan dittany
- Cretan rock rose
- crevice alumroot
- Crimean iris
- crimson bee balm
- crimson clematis
- Crimson clover
- crimson glory vine
- crimson spot rock rose
- crisphead lettuce
- crocus
- crosswort
- croton
- crowberry
- crown imperial
- crown of thorns
- crown pink
- crown vetch
- Cuban royal palm
- cuckoo bittercress
- cuckoo flower
- cuckoo pint
- cucumber
- cucumber magnolia
- cucumber tree
- cultivated fenugreek
- Culver's root
- Cumberland azalea
- cup plant
- curlytop knotweed
- currant
- curry plant
- curry tree
- cushion spurge
- cut-leaved daisy
- cut-leaved mallow
- cut-leaved teasel
- cutleaf beech
- cutleaf cone flower
- cutleaf crab apple
- cycad
- cyclamen-flowered daffodil
- Cyme-flowered rock rose
- cypress
- cypress spurge