Brunnera macrophylla Brunnera macrophylla 'Hadspen Cream'
Brunnera macrophylla 'Jack Frost' Brunnera macrophylla 'Langtrees'
Brunnera macrophylla 'Langtrees ('Aluminum Spot')' Brunnera macrophylla 'Silver Wings'
Brunnera macrophylla 'Variegata' Buchloe dactyloides 'Sharps Improved'
Bulbine frutescens Bulbinella latifolia var. doleritica
Bulbocodium vernum Buphthalmum salicifolium
Burrageara 'Nelly Isler (Swiss Beauty)' Butomus umbellatus
Cabomba caroliniana Cakile maritima
Caladium bicolor Caladium bicolor 'Candidum'
Caladium bicolor 'F.M. Joyner' Caladium bicolor 'Rosebud'
Caladium lindenii Calamagrostis x acutiflora 'Eldorado'
Calamagrostis x acutiflora 'Karl Foerster' Calamagrostis x acutiflora 'Lembterg'
Calamagrostis x acutiflora 'Overdam' Calamagrostis x acutiflora 'Stricta'
Calamagrostis arundinacea Calamagrostis foliosa
Calamintha grandiflora Calamintha grandiflora 'Variegata'
Calamintha nepeta Calamintha nepetoides 'White Cloud'
Calandrinia grandiflora Calandrinia umbellata
Calathea bella Calathea loeseneri
Calathea makoyana Calathea picturata
Calceolaria x 'Cinderella Mix' Calceolaria x 'Cinderella Red'
Calceolaria x 'Cinderella Yellow with Dots' Calceolaria crenatiflora
Calceolaria falklandica Calendula officinalis
Calendula officinalis 'Alpha' Calendula officinalis 'Ball's Gold'
Calendula officinalis 'Bon Bon Apricot' Calendula officinalis 'Bon Bon Orange'
Calendula officinalis 'Bon Bon Yellow' Calendula officinalis 'Coffee Cream'
Calendula officinalis 'Fiesta Gitana' Calendula officinalis 'Greenheart Orange'
Calendula officinalis 'Indian Prince' Calendula officinalis 'Kablouna'
Calendula officinalis 'Pacific Beauty' Calendula officinalis 'Pink Surprise'
Calendula officinalis 'Porcupine' Calendula officinalis 'Princess Black Centered Orange'
Calendula officinalis 'Resina' Calendula suffruticosa ssp. maritima 'Sunlovers Skyfire'
Calibrachoa 'Aloha Neon Vulcano' Calibrachoa 'Aloha Tiki Soft Pink'
Calibrachoa 'Callie® (Peach)' Calibrachoa 'Can-Can® (Terracotta)'
Calibrachoa 'Colorful Expressions™' Calibrachoa 'Colorful Expressions™ California Gold Rush'
Calibrachoa 'Colorful Expressions™ Cherry Rose' Calibrachoa 'Colorful Expressions™ Cranberry'
Calibrachoa 'Colorful Expressions™ Deep Yellow' Calibrachoa 'Colorful Expressions™ Rose'
Calibrachoa 'Colorful Expressions™ Scarlet Red' Calibrachoa 'Million Bells® Trailing Blue'
Calibrachoa 'Million Bells®Cherry Pink' Calibrachoa 'MiniFamous™ Purple Sand'
Calibrachoa 'Noa™ (Almond Blossom)' Calibrachoa 'Spring Fling Rose Improved'
Calibrachoa 'Spring Fling Yellow' Calibrachoa 'Starlette Trailing Pink'
Calibrachoa 'USCALI11 (Superbells® Pink)' Calibrachoa 'USCALI17 (Superbells® Cherry Red)'
Calibrachoa 'USCALI28 (Superbells® Red)' Calibrachoa 'USCALI386-2 (Superbells® White)'
Calibrachoa 'USCALI411-7 (Superbells® Dreamsicle)' Calibrachoa 'USCALI53M (Tequila Sunrise)'
Callirhoe involucrata Callistephus chinensis 'Pompom'
Calochortus clavatus Caltha palustris
Calylophus berlandieri Calylophus hartwegii
Camassia cusickii Camassia leichtlinii 'Coerulea'
Camassia quamash 'Alba' Camissonia cheiranthifolia