Cottage Pink (spp.) Cottage Pink 'Ideal Violet'
Cottage Pink 'Vanilla' Cotton
'Cotton Candy' Astilbe 'Cotton Candy' Azalea
'Cotton Candy' Moss Phlox 'Cotton Cool' Lungwort: hybrid
Cotton Lavender (spp.) Cotton Lavender Dwarf
Cotton Lavender 'Lavender Cotton' Cotton Lavender 'Lemon Queen'
'Cotton Tail' Sea Thrift Cotton, Arabian 'Nigra'
Cotton, Levant 'Nigra' Cotton, Wild (spp.)
Cotton, Wild 'Disco' Cotton, Wild 'Luna Red'
Cotton, Wild 'Southern Belle' Cottontree, Silk
Cottonwood Cottonwood, Eastern
Cottonwood, Fremont Cottonwood, Lanceleaf
Cottonwood, Plains Cottonwood, Western
Cottonwood: deltoides, Eastern Cottonwood: monticola
Cottonwood: wilsonii Cotyledon
Couch 'Austrailia' Couch 'Santa Ana'
Coulter Pine 'Council Fire' Possum Haw Holly
Council Tree Country Borage (spp.)
'County Wicklow' Scotch Heather 'Courage' Rose
'Court Troubador' Daylily Cow Horn
Cow Horn Agave Cow Itch Tree
Cow Parsley 'RavensWing' Cow Vine (spp.)
Cow Vine 'Crimson Trumpet' Cow Vine 'Flava'
Cowberry Cowboy Primrose
'Cowichan' Primrose: hybrid Cow's Tail Pine (spp.)
Cow's Tail Pine 'Fastigiata' Cow's Tail Pine 'Korean Gold'
Cow's Tail Pine 'Prostrata' Cowslip
Cowslip Lungwort (spp.) Cowslip, Common (spp.)
Cowslip, Giant (spp.) Cowslip, Giant 'Ceperly Hybrid'
Cowslip, Jerusalem 'Sissinghurst White' Cowslip, Meadow (spp.)
Cowslip, Tibetan (spp.) Cowslip, Tibetan 'Ceperly Hybrid'
Coyote Brush: pilularis consanguinea Coyote Bush
Coyote Bush 'Starn' Coyote Bush: pilularis consanguinea
Coyote Melon Crab Cactus
Crabapple (spp.) Crabapple 'Adams'
Crabapple 'Amberina' Crabapple 'Beverly'
Crabapple 'Burgundy' Crabapple 'Callaway'
Crabapple 'David' Crabapple 'Dolgo'
Crabapple 'Donald Wyman' Crabapple 'Dorothea'
Crabapple 'Ellwangeriana' Crabapple 'Gordon'
Crabapple 'Harvest Gold™' Crabapple 'Jewelberry'
Crabapple 'Mary Potter' Crabapple 'Prairifire'
Crabapple 'Professor Sprenger' Crabapple 'Profusion'
Crabapple 'Red Barron' Crabapple 'Red Jade'
Crabapple 'Red Jewel™' Crabapple 'Red Splendor'
Crabapple 'Robinson' Crabapple 'Selkirk'
Crabapple 'Sentinel' Crabapple 'Silver Moon'
Crabapple 'Snowdrift' Crabapple 'Spring Sensation™'
Crabapple 'Spring Snow' Crabapple 'White Angel'
Crabapple 'White Gold' Crabapple 'Winter Gold'
Crabapple, Calva Crabapple, Chonosuki
Crabapple, Cutleaf (spp.) Crabapple, Cutleaf 'Golden Raindrops®'
Crabapple, Flowering Japanese Crabapple, Flowering (spp.)
Crabapple, Flowering Tea Crabapple, Flowering 'Adams'
Crabapple, Flowering 'Amberina' Crabapple, Flowering 'Beverly'
Crabapple, Flowering 'Burgundy' Crabapple, Flowering 'Callaway'
Crabapple, Flowering 'David' Crabapple, Flowering 'Dolgo'
Crabapple, Flowering 'Donald Wyman' Crabapple, Flowering 'Dorothea'
Crabapple, Flowering 'Ellwangeriana' Crabapple, Flowering 'Gordon'
Crabapple, Flowering 'Harvest Gold™' Crabapple, Flowering 'Jewelberry'
Crabapple, Flowering 'Mary Potter' Crabapple, Flowering 'Prairifire'
Crabapple, Flowering 'Professor Sprenger' Crabapple, Flowering 'Profusion'
Crabapple, Flowering 'Red Barron' Crabapple, Flowering 'Red Jade'
Crabapple, Flowering 'Red Jewel™' Crabapple, Flowering 'Red Splendor'
Crabapple, Flowering 'Robinson' Crabapple, Flowering 'Selkirk'
Crabapple, Flowering 'Sentinel' Crabapple, Flowering 'Silver Moon'
Crabapple, Flowering 'Snowdrift' Crabapple, Flowering 'Spring Sensation™'
Crabapple, Flowering 'Spring Snow' Crabapple, Flowering 'White Angel'
Crabapple, Flowering 'White Gold' Crabapple, Flowering 'Winter Gold'
Crabapple, Pillar Crabapple, Prairie
Crabapple, Sargent (spp.) Crabapple, Sargent 'Tina'
Crabapple, Siberian (spp.) Crabapple, Siberian 'Jackii'
Crabapple, Southern Crabapple, Tea
Crabapple, Tschonoskii Crabapple, Yunnan
Crabapple: arnoldianahybrid Crabgrass
Crabwood