Cicerbita Cigar Flower (spp.)
Cigar Flower: lanceolata Cigar Plant (spp.)
Cigar Plant, Tall 'Cinderella Mix' Pocketbook Plant: hybrid
'Cinderella Red' Pocketbook Plant: hybrid 'Cinderella Yellow with Dots' Pocketbook Plant: hybrid
Cineraria, Florist's (spp.) Cineraria, Florist's 'Cornflower Blue'
'Cinnamon Bear' Foamy Bells Cinnamon Cactus
'Cinnamon' Sweet Basil Cinquefoil, Creeping
Cinquefoil, Five Finger Cinquefoil, Nepal 'Ron McBeath'
Cinquefoil, Spring Cinquefoil, Woolly
Cinquefoil: megalantha Cinquefoil: nepalensis 'Ron McBeath'
Cinquefoil: tongueihybrid 'Cirrus' Dusty Miller: cineraria
'Cisty Joiner' Daylily 'Citriodorum' Sweet Basil
'Citronella' Dog's Tooth Violet 'Citronella' Spanish Flag
'Citrus' Lemon-Scented Thyme 'Clairette' Dwarf Iris
'Clara Curtis' Korean Chrysanthemum 'Clarence Simon' Daylily
'Clarence' Tall Bearded German Iris Clarke's Geranium 'Kashmir Purple'
Clarkia Clarkia, Botta's
'Clarks Red' Common Sugarbush Clary Sage (spp.)
'Claryssa Blue' Painted Sage 'Claryssa Mix' Painted Sage
Clasping Coneflower 'Classic Golden Orange' Creeping Zinnia: angustifolia
'Claude Barre' Penstemon Clavelina Cactus
Clematis (spp.) Clematis 'Alexander'
Clematis, Blue (spp.) Clematis, Blue 'Hanajina'
Clematis, Blue 'Rosea' Clematis, Evergreen (spp.)
Clematis, Fall Clematis, Ground 'Purpurea'
Clematis, Hybrid (spp.) Clematis, Hybrid 'Asao'
Clematis, Hybrid 'Blue Angel (Blekitny Aniol)' Clematis, Hybrid 'Cardinal Wyszynski'
Clematis, Hybrid 'Carnaby' Clematis, Hybrid 'Dorota'
Clematis, Hybrid 'Guernsey Cream' Clematis, Hybrid 'John Paul II'
Clematis, Hybrid 'Mme Le Coultre' Clematis, Hybrid 'Montana Rubens'
Clematis, Hybrid 'Mrs. N. Thompson' Clematis, Hybrid 'Multi Blue'
Clematis, Hybrid 'Pink Fantasy' Clematis, Hybrid 'Ramona'
Clematis, Hybrid 'Sho-Un' Clematis, Hybrid 'Silver Moon'
Clematis, Hybrid 'Snow Queen' Clematis, Hybrid 'Sunset'
Clematis, Hybrid 'Sweet Summer Love' Clematis, Hybrid 'Vyvyan Pennell'
Clematis, Hybrid 'Warsaw Nike' Clematis, Hybrid 'Will Goodwin'
Clematis, Jackman (spp.) Clematis, Jackman 'Purpurea Superba'
Clematis, Large Petal 'Markham's Pink' Clematis, Scarlet 'Duchess of Albany'
Clematis, Sweet Autumn Clematis, Texas 'Duchess of Albany'
Clematis, Tube 'Alan Bloom' Clematis: (n) 'Jackmanii'
Clematis: lanuginosa 'Red Cardinal' Clematis: montana rubens
Clematis: ochroleuca Clematis: tangutica (spp.)
Clematis: tangutica 'Helios' Clematis: terniflora, Sweet Autumn
'Cleo' Daylily 'Cleopatra' Scarlet Sage: splendens
'Cleveland Morgan' Hen and Chickens 'Clevelandii' Peace Lily
Cliff Brake Fern Cliff Maids (spp.)
Cliff Maids 'Ashwood Strain' Cliff Maids 'Hybrid Mix'