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▶ Cakile
Common name: Searocket
▶ Calandrinia
Common name: Redmaids
▶ Calendula
Common name: Pot marigold
▶ Callicarpa
Common name: Beauty-berry
▶ Callirhoe
Common name: Poppy-mallow
▶ Callitriche
Common name: Water-starwort
▶ Calochortus
Common name: Mariposa lily
▶ Caltha
Common name: Marsh-marigold
▶ Calyptocarpus
Common name: Straggler daisy
▶ Calystegia
Common name: Hedge bindweed
▶ Camassia
Common name: Camas
▶ Camelina
Common name: False-flax
▶ Campanula
Common name: Bellflower
▶ Campsis
Common name: Trumpet-creeper
▶ Cannabis
Common name: Hemp
▶ Capsella
Common name: Shepherd's-purse
▶ Caragana
Common name: Peatree
▶ Cardamine
Common name: Bittercress
▶ Cardaria
Common name: Whitetop
▶ Cardionema
Common name: Sandmat
▶ Carduus
Common name: Plumeless thistle
▶ Carex
Common name: Sedge
▶ Carlina
Common name: Carline thistle
▶ Carpobrotus
Common name: Ice-plant
▶ Carthamus
Common name: Distaff thistle
▶ Carum
Common name: Caraway
▶ Cassia
Common name: Cassia
▶ Cassytha
Common name: Love-vine
▶ Casuarina
Common name: She-oak
▶ Catalpa
Common name: Catalpa
▶ Catharanthus
Common name: Rosy periwinkle
▶ Ceanothus
Common name: Buckbrush
▶ Celosia
Common name: Cock's-comb
▶ Celtis
Common name: Hackberry
▶ Cenchrus
Common name: Sandburr
▶ Centaurea
Common name: Knapweed, starthistle
▶ Centaurium
Common name: Centaury
▶ Centranthus
Common name: Red valerian
▶ Centromadia
Common name: Spikeweed
▶ Centrosema
Common name: Butterfly-pea
▶ Cephalanthus
Common name: Buttonbush
▶ Cerastium
Common name: Mouse-ear chickweed
▶ Ceratocephala
Common name: Bur buttercup
▶ Ceratophyllum
Common name: Coon-tail
▶ Chaenactis
Common name: False yarrow
▶ Chaenomeles
Common name: Flowering quince
▶ Chaenorrhinum
Common name: Dwarf snapdragon
▶ Chaerophyllum
Common name: Chervil
▶ Chaiturus
Common name: Lion's-tail
▶ Chamaecrista
Common name: Partridge-pea
▶ Chamaenerion
Common name: Fireweed
▶ Chasmanthium
Common name: Wood-oats
▶ Chelidonium
Common name: Celandine
▶ Chenopodium
Common name: Lamb'squarters
▶ Chionodoxa
Common name: Glory-of-the-snow
▶ Chloris
Common name: Windmillgrass
▶ Chondrilla
Common name: Skeletonweed
▶ Chorispora
Common name: Blue mustard
▶ Chrysanthemum
Common name: Chrysanthemum
▶ Chrysothamnus
Common name: Rabbitbrush
▶ Cicer
Common name: Chickpea, garbanzo bean
▶ Cichorium
Common name: Chickory
▶ Cicuta
Common name: Water hemlock
▶ Circaea
Common name: Enchanter's-nightshade
▶ Cirsium
Common name: Thistle
▶ Citrullus
Common name: Citrullus lanatus
▶ Cladonia
Common name: British soldiers
▶ Clarkia
Common name: Clarkia
▶ Claytonia
Common name: Miner's-lettuce
▶ Clematis
Common name: Clematis
▶ Cleome
Common name: Beeplant
▶ Clinopodium
Common name: Wild basil
▶ Cnicus
Common name: Blessed thistle
▶ Cnidoscolus
Common name: Bull nettle
▶ Cobaea
Common name: Cathedral-bells
▶ Collinsia
Common name: Baby bluelips
▶ Collomia
Common name: Mountain-trumpet
▶ Colocasia
Common name: Taro
▶ Colutea
Common name: Bladder senna
▶ Comandra
Common name: Bastard toadflax
▶ Commelina
Common name: Dayflower
▶ Conium
Common name: Poison hemlock
▶ Conoclineum
Common name: Mistflower
▶ Conringia
Common name: Hare's-ear mustard
▶ Consolida
Common name: Knight's-spur
▶ Convallaria
Common name: Lily-of-the-valley
▶ Convolvulus
Common name: Bindweed
▶ Conyza
Common name: Mare'stail
▶ Coreopsis
Common name: Tickseed
▶ Coriandrum
Common name: Coriander
▶ Cornus
Common name: Dogwood
▶ Coronopus
Common name: Lesser pepperwort
▶ Cortaderia
Common name: Giant reed
▶ Corydalis
Common name: Fumewort
▶ Cosmos
Common name: Cosmos
▶ Cotinus
Common name: Smoketree
▶ Cotoneaster
Common name: Cotoneaster
▶ Cotula
Common name: Brassbuttons
▶ Crambe
Common name: Crambe
▶ Crataegus
Common name: Hawthorn
▶ Crepis
Common name: Hawk'sbeard
▶ Cressa
Common name: Alkaliweed
▶ Crocosmia
Common name: Crocosmia
▶ Crocus
Common name: Crocus
▶ Crotalaria
Common name: Rattlebox
▶ Croton
Common name: Croton
▶ Cruciata
Common name: Crosswort
▶ Crupina
Common name: Crupina
▶ Cryptantha
Common name: Cryptantha
▶ Cryptotaenia
Common name: Honewort
▶ Cucurbita
Common name: Gourd
▶ Cuscuta
Common name: Dodder
▶ Cyclachaena
Common name: Sumpweed, marshelder
▶ Cycloloma
Common name: Winged pigweed
▶ Cyclospermum
Common name: Marsh-parsley
▶ Cymbalaria
Common name: Kenilworth ivy
▶ Cymopteris
Common name: Spring parsley
▶ Cynanchum
Common name: Honeyvine
▶ Cynara
Common name: Cardoon
▶ Cynodon
Common name: Bermudagrass
▶ Cynoglossum
Common name: Hound's-tongue
▶ Cynosurus
Common name: Dogtailgrass
▶ Cyperus
Common name: Flatsedge
▶ Cypripedium
Common name: Ladyslipper orchid
▶ Cytisus
Common name: Broom