Complete list of species
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| scientific name | common name(s) | image gallery |
| Cornus ×intermedia | Arctic Dogwood Dogwood | |
| Cornus ×slavinii | Dogwood Slavin's Dogwood | |
| Corydalis aurea | Scrambled Eggs Golden Corydalis | |
| Corydalis caseana | Sierra Fumewort | |
| Corydalis caseana ssp. aquae-gelidae | Coldwater Fumewort Marsh Corydalis | |
| Corydalis caseana ssp. brachycarpa | Sierra Fumewort Wasatch Fitweed | |
| Corydalis caseana ssp. brandegeei | Brandegee's Fumewort | |
| Corydalis caseana ssp. caseana | Sierra Corydalis Sierra Fumewort | |
| Corydalis caseana ssp. cusickii | Cusick's Fumewort Sierra Corydalis | |
| Corydalis caseana ssp. hastata | Sierra Corydalis Sierra Fumewort | |
| Corydalis crystallina | Mealy Corydalis Mealy Fumewort | |
| Corydalis curvisiliqua | Curvepod Fumewort Scrambled Eggs Golden Smoke Curvepod | |
| Corydalis curvisiliqua ssp. curvisiliqua | Curvepod Fumewort | |
| Corydalis curvisiliqua ssp. grandibracteata | Curvepod Fumewort Large-bracted Corydalis | |
| Corydalis curvisiliqua ssp. occidentalis | Curvepod Fumewort Large-bracted Corydalis Scrambled Eggs | |
| Corydalis flavula | Yellow Fumewort Yellow Harlequin | |
| Corydalis micrantha | Smallflower Fumewort Southern Corydalis Golden Corydalis | |
| Corydalis micrantha ssp. australis | Smallflower Fumewort | |
| Corydalis micrantha ssp. micrantha | Small-flower Fumewort Smallflower Fumewort | |
| Corydalis micrantha ssp. texensis | Texan Fumewort Texas Corydalis | |
| Corydalis pauciflora | Few-flowered Corydalis Fewflower Fumewort | |
| Corydalis scouleri | Scouler's Fumewort Western Corydalis Scouler Corydalis | |
| Corydalis sempervirens | Rock Harlequin | |
| Corylus americana | American Hazelnut American Filbert | |
| Corylus cornuta | Beaked Hazelnut Beaked Filbert | |
| Corylus cornuta var. californica | California Hazelnut | |
| Corylus cornuta var. cornuta | Beaked Hazel Beaked Hazelnut | |
| Coryphantha echinus | Rhinoceros Cactus | |
| Coryphantha macromeris | Nipple Beehive Cactus Big-needle Pincushion Cactus | |
| Coryphantha macromeris var. macromeris | Nipple Beehive Cactus Big Needle Cactus Big Nipple Cory-cactus Dona Ana Long Mamma | |
| Coryphantha macromeris var. runyonii | Runyon's Beehive Cactus | |
| Coryphantha nickelsiae | Nickels' Cactus Nickels’s Pincushion Cactus | |
| Coryphantha ramillosa | Whiskerbrush | |
| Coryphantha recurvata | Santa Cruz Beehive Cactus | |
| Coryphantha robustispina | Devil's Pincushion Long-tubercle Beehive Cactus Pineapple Cactus | |
| Coryphantha robustispina ssp. robustispina | Devil's Pincushion Long-tubercle Beehive Cactus Pineapple Cactus | |
| Coryphantha robustispina ssp. scheeri | Scheer's Beehive Cactus Scheer's Pincushion Cactus | |
| Coryphantha robustispina ssp. uncinata | Scheer's Beehive Cactus Scheer's Pincushion Cactus | |
| Coryphantha sulcata | Pineapple Cactus Nipple Cactus | |
| Cosmos caudatus | Wild Cosmos | |
| Cosmos parviflorus | Southwestern Cosmos Southwest Cosmos | |
| Cotinus obovatus | American Smoke Tree Texas Smoke Tree Wild Smoke Tree Smoke Tree Smokebush Chittamwood | |
| Cottea pappophoroides | Cotta Grass | |
| Coursetia axillaris | Texas Babybonnets | |
| Coursetia caribaea | Anil Falso | |
| Coursetia caribaea var. sericea | Anil Falso | |
| Coursetia glabella | Smooth Babybonnets | |
| Coursetia glandulosa | Coursetia Rosary Baby-bonnets Rosary Babybonnets | |
| Cranichis muscosa | Cypress-knee Helmet Orchid Moss Orchid | |
| Crassula aquatica | Water Pygmyweed | |
| Crassula connata | Pygmy Weed Sand Pygmy Weed Sand Pygmyweed | |
| Crassula connata var. connata | Pygmy Weed Sand Pygmy Weed Sand Pygmyweed | |
| Crassula connata var. erectoides | Pygmy Weed Sand Pygmy Weed Sand Pygmyweed | |
| Crassula connata var. eremica | Pygmy Weed Sand Pygmy Weed Sand Pygmyweed | |
| Crassula connata var. subsimplex | Pygmy Weed Sand Pygmy Weed Sand Pygmyweed | |
| Crassula drummondii | Small-leaf Pygmy Weed Small-leaf Pygmyweed | |
| Crassula longipes | Smallseed Pygmyweed | |
| Crassula saginoides | River-leek Water Pygmy Weed Wrinkleseed Pygmyweed | |
| Crassula solieri | Little Pygmy Weed Smooth-seed Pygmyweed Smoothseed Pygmyweed | |
| Crassula viridis | Pricklyseed Pygmy Weed Pricklyseed Pygmyweed | |
| Crataegus aemula | Rome Hawthorn | |
| Crataegus aestivalis | Mayhaw May Hawthorn | |
| Crataegus alma | Bountiful Hawthorn | |
| Crataegus ambitiosa | Grand Rapids Hawthorn | |
| Crataegus anamesa | Fort Bend Hawthorn | |
| Crataegus ancisa | Mississippi Hawthorn | |
| Crataegus annosa | Phoenix City Hawthorn | |
| Crataegus apiomorpha | Fort Sheridan Hawthorn | |
| Crataegus arborea | Montgomery Hawthorn | |
| Crataegus arcana | Carolina Hawthorn | |
| Crataegus arrogans | Dixie Hawthorn | |
| Crataegus ater | Nashville Hawthorn | |
| Crataegus atrovirens | Hawthorn | |
| Crataegus austromontana | Valley Head Hawthorn | |
| Crataegus beadlei | Beadle's Hawthorn | |
| Crataegus beata | Dunbar's Hawthorn | |
| Crataegus berberifolia | Barberry Hawthorn | |
| Crataegus bona | Berks County Hawthorn | |
| Crataegus brachyacantha | Blueberry Haw Blueberry Hawthorn Hoghaw Pomette Bleue | |
| Crataegus brainerdii | Brainerd's Hawthorn | |
| Crataegus brazoria | Brazos Hawthorn | |
| Crataegus calpodendron | Pear Hawthorn Late Hawthorn Pear Haw Pear Thorn | |
| Crataegus canadensis | Canadian Hawthorn | |
| Crataegus carrollensis | Eureka Springs Hawthorn | |
| Crataegus castlegarensis | Castlegar Hawthorn Hawthorn | |
| Crataegus chrysocarpa | Fireberry Hawthorn | |
| Crataegus chrysocarpa var. chrysocarpa | Fireberry Hawthorn Red Haw Red-fruited Hawthorn Scarlet Hawthorn | |
| Crataegus chrysocarpa var. piperi | Piper's Hawthorn Columbia Hawthorn | |
| Crataegus coccinioides | Kansas Hawthorn | |
| Crataegus coleae | Cole's Hawthorn | |
| Crataegus compacta | Clustered Hawthorn Thames Hawthorn | |
| Crataegus compta | Adorned Hawthorn | |
| Crataegus condigna | River Junction Hawthorn | |
| Crataegus consanguinea | Tallahassee Hawthorn | |
| Crataegus contrita | Southern Hawthorn | |
| Crataegus corusca | Shiningbranch Hawthorn Gleaming Hawthorn | |
| Crataegus crus-galli | Cockspur Hawthorn Cockspur Thorn Newcastle Hawthorn Newcastle Thorn Hog Apple | |
| Crataegus dallasiana | Dallas Hawthorn | |
| Crataegus desueta | New York Hawthorn | |
| Crataegus dilatata | Broadleaf Hawthorn | |
| scientific name | common name(s) | image gallery |
