| Caesalpinia ferraea |
Brazilian Ironwood |
 |
| Caesalpinia gilliesii |
Bird of Paradise |
 |
| Caesalpinia pulcherrima |
Barbados Pride |
 |
| Calamintha grandiflora |
Calamint |
|
| Calandrinia aff caespitosa |
Rock Purslane |
|
| Calceolaria mexicana |
Slipper Flower |
|
| Calendula officinalis |
Marigold, English Marigold, Pot Marigold |
 |
| Calliandra (many) |
Powder Puff Tree |
|
| Calliandra |
Powder Puff Tree |
|
| Callianthemum |
Callianthemum |
|
| Callirhoe involucrata |
Poppy Mallow |
|
| Callistemon (many) |
Bottle Brush |
|
| Callistephus chinensis |
Chinese Aster |
|
| Calochortus (many) |
Mariposa Tulip |
|
| Calothamnus quadrifidus |
One-sided Bottlebrush |
|
| Caltha polypetala |
Marsh Marigold |
|
| Calycanthus floridus |
Carolina Allspice |
|
| Calycanthus occidentalis |
Western Spice Bush, California Allspice |
|
| Calyptridium umbellatum |
Pussy Paws |
 |
| Camassia (many) |
Camass |
|
| Camassia |
Camass |
|
| Camellia japonica |
Japanese Camellia |
|
| Campanula (many) |
Bellflower |
|
| Campanula alliarifolia |
Ivory Bells |
|
| Campanula alpestris |
Alpine Bellflower |
|
| Campanula aucheri |
Bellflower |
|
| Campanula autraniana |
Bellflower |
|
| Campanula barbata |
Bearded Bellflower |
|
| Campanula bellidifolia |
Daisy-leaved Bellflower |
|
| Campanula besengenica |
Bellflower |
|
| Campanula cervicaria |
Bellflower |
|
| Campanula chamissonis |
Bellflower |
|
| Campanula cochlearifolia |
Fairies' Thimbles |
|
| Campanula fragilis |
Fragile Bellflower |
|
| Campanula glomerata |
Clustered Bellflower |
|
| Campanula incurva |
Bellflower |
|
| Campanula koleantiana |
Bellflower |
|
| Campanula lactiflora |
Milky Bellflower |
 |
| Campanula latifolia |
Greater Bellflower |
|
| Campanula latifolia 'Burghaltii' |
Greater Bellflower |
|
| Campanula lusitanica |
Bellflower |
|
| Campanula lyrata |
Bellflower |
|
| Campanula makaschvillii |
Bellflower |
|
| Campanula medium v calycanthema |
Canterbury Bells |
|
| Campanula persicifolia |
Peach-leaved Bellflower |
|
| Campanula rotundifolia |
Harebell |
|
| Campanula scheuchzeri |
Bellflower |
|
| Campanula takesimana 'Elizabeth' |
Bellflower |
|
| Campanula thessala |
Bellflower |
|
| Campanula tomassiniana |
Bellflower |
|
| Campanula topaliana |
Bellflower |
|
| Campanula trachelium |
Nettle-leaved Bellflower |
|
| Campanula tridentata |
Bellflower |
|
| Campanula wanneri |
Bellflower |
|
| Campanula zoysii |
Crimped Bellflower |
|
| Campsis radicans |
Trumpet Vine |
|
| Campsis tagliabuana |
Trumpet Vine |
|
| Canna (many) |
Indian Shot |
|
| Canna indica |
Indian Shot |
|
| Canna 'Intrigue' |
Canna Hybrid |
|
| Canna speciosa |
Canna |
|
| Capparis inermis |
Caper |
|
| Capparis mitchellii |
Native Orange |
|
| Cardamine pratensis |
Lady's Smock, Cuckoo Flower |
|
| Carica (many) |
Pawpaw, Papaya |
|
| Carica candamarensis |
Mountain Pawpaw |
|
| Carica papaya |
Pawpaw, Papaya |
|
| Carica quercifolia |
Pawpaw, Papaya |
|
