Caesalpinia

Calamagrostis

Calamintha

Calendula

Calliandra

Callicarpa

Callisia

Callistemon

Calocedrus

Calocephalus

Caltha

Calycanthus

Calylophus

Camassia

Camellia

Campanula

Campsis

Camptotheca

Cantua

Caragana

Cardamine

Cardiandra

Cardiocrinum

Carex

Carpenteria

Carpinus

Carum

Carya

Caryopteris

Cassia

Castanea

Castanopsis

Catalpa

Catananche

Ceanothus

Cedrus

Celastrus

Celtis

Cenolophium

Centaurea

Centranthus

Cephalanthus

Cephalaria

Cephalotaxus

Cerastium

Ceratostigma

Cercidiphyllum

Cercis

Cestrum

Chaenomeles

Chamaecyparis

Chamaedaphne

Chamaemelum

Chamerion

Chasmanthium

Cheilanthes

Chelone

Chelonopsis

Chenopodium

Chiastophyllum

Chilopsis

Chimonanthus

Chionanthus

Chionochloa

Chitalpa

Chloranthus

Choisya

Chosenia

Chrysanthemum

Chrysogonum

Chrysosplenium

Cichorium

Cinnamomum

Cirsium

Cistus

Citharexylum

Citronella

Cladrastis

Claytonia

Clematis

Clerodendrum

Clethra

Cocculus

Colletia

Colocasia

Colquhounia

Colutea

Comanthosphace

Comptonia

Convallaria

Convolvulus

Coprosma

Cordia

Cordyline

Coreopsis

Cornus

Corokia

Coronilla

Correa

Cortaderia

Corydalis

Corylopsis

Corylus

Cosmos

Cotinus

Cotoneaster

Crambe

Crataegomespilus

Crataegus

Crinodendron

Crocosmia

Cryptomeria

Cryptotaenia

Cunninghamia

Cupressocyparis

Cupressus

Cyathea

Cyclamen

Cydonia

Cymbalaria

Cynanchum

Cynara

Cyrilla

Cyrtomium

Cytisus