Corokia x virgata 'Yellow Wonder' Correa 'Carmine Bells'
Correa 'Dusky Bells' Correa backhousiana
Correa harrisii x Correa lawrenciana
Correa pulchella Correa reflexa var. nummularlifolia
Cortaderia selloana Cortaderia selloana 'Aureolineata'
Cortaderia selloana 'Aureo-Picta' Cortaderia selloana 'Pumila'
Cortaderia selloana 'Silver Comet' Cortaderia selloana 'White'
Cortaderia toetoe Corydalis aurea
Corydalis elata 'Rhythm 'n' Blues' Corydalis flexuosa 'Blue Panda'
Corydalis flexuosa 'China Blue' Corydalis flexuosa 'Purple Leaf'
Corydalis lutea Corydalis lutea 'Alba'
Corydalis micrantha Corydalis ochroleuca
Corylopsis glabrescens Corylopsis grandulifera var. hypoglauca
Corylopsis pauciflora Corylopsis sinensis var. calvescens
Corylopsis spicata Corylopsis spicata 'Aurea'
Corylopsis spicata 'Gold Spring' Corylus americana
Corylus avellana 'Atropurpurea' Corylus avellana 'Contorta'
Corylus avellana 'Contorta Purpurea' Corylus colurna
Corymbia abergiana Corymbia eximia
Corymbia intermedia Corymbia leichhardtii
Corymbia maculata Corymbia watsoniana
Corynephorus canescens 'Spiky Blue' Corynocarpus laevigata
Corypha umbraculifera Corypha utan
Coryphantha elephantidens Coryphantha erecta
Corytoplectus capitatus Corytoplectus cutucuensis
Cosmos atrosanguineus Cosmos bipinnatus
Cosmos bipinnatus 'Early Wonder' Cosmos bipinnatus 'Sonata White'
Cosmos sulphureus Cosmos sulphureus 'Cosmic Orange'
Cosmos sulphureus 'Cosmic Red' Cosmos sulphureus 'Cosmic Yellow'
Cosmos sulphureus 'Ladybird Scarlet' Cosmos sulphureus 'Lemon Twist'
Cosmos sulphureus 'Sunny Red' Costus barbatus
Costus comosus Costus curvibracteatus
Costus cuspidatus Costus malortieanus
Costus pictus Costus pulverulentus
Costus speciosus Costus speciosus 'Nova'
Costus speciosus 'Variegatus' Costus varzearum
Costus woodsonii Cotinus x 'Grace'
Cotinus coggygria Cotinus coggygria 'Flame'
Cotinus coggygria 'Golden Spirit' Cotinus coggygria 'Purple Robe'
Cotinus coggygria 'Purpureus' Cotinus coggygria 'Royal Purple'
Cotinus coggygria 'Velvet Cloak' Cotinus coggygria 'Young Lady'
Cotinus obovatus Cotinus obovatus X C. coggygria