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| scientific name | common name(s) | image gallery |
| Clarkia cylindrica | Speckled clarkia | |
| Clarkia dudleyana | Dudley's clarkia | |
| Clarkia epilobioides | Canyon clarkia | |
| Clarkia imbricata | Vine Hill clarkia | |
| Cleome isomeris | Bladderpod spiderflower Bladderpod | |
| Clematis lasiantha | Pipestem clematis Pipestems Chaparral clematis | |
| Clematis ligusticifolia | Western white clematis Virgin's bower Pepper vine Hierba de chivo | |
| Cleome lutea | Yellow spiderflower Yellow spider-flower Yellow beeplant Yellow caper Golden caper | |
| Clarkia pulchella | Deerhorn clarkia Beautiful clarkia Ragged robin Pink fairies | |
| Clarkia purpurea | Winecup clarkia | |
| Clarkia rhomboidea | Diamond clarkia | |
| Clarkia rubicunda | Ruby chalice clarkia | |
| Cleome serrulata | Rocky Mountain beeplant Rocky mountain bee plant Waa Skunk weed | |
| Clarkia speciosa | Redspot clarkia | |
| Clarkia unguiculata | Elegant clarkia Elegant fairyfan Mountain garland | |
| Claytonia virginica | Virginia springbeauty Springbeauty | |
| Clarkia williamsonii | Fort Miller clarkia | |
| Clarkia xantiana | Gunsight clarkia Xantus clarkia | |
| Collinsia bartsiifolia | White blue eyed Mary | |
| Conoclinium coelestinum | Blue mistflower | |
| Cornus drummondii | Roughleaf dogwood Drummond's dogwood Rough-leaf dogwood | |
| Cornus florida | Flowering dogwood Virginia dogwood | |
| Collinsia grandiflora | Blue lips Blue-lips blue-eyed Mary Giant blue eyed Mary | |
| Collinsia heterophylla | Purple Chinese houses Harlequin blue-eyed Mary Chinese houses | |
| Coreopsis lanceolata | Lanceleaf coreopsis Lanceleaf tickseed Lance-leaved coreopsis Sand coreopsis | |
| Collinsia linearis | Narrowleaf blue eyed Mary | |
| Cornus obliqua | Silky dogwood Pale dogwood Swamp dogwood Kinnikinnik | |
| Coreopsis palmata | Stiff tickseed Stiff coreopsis Finger coreopsis | |
| Cosmos parviflorus | Southwest cosmos Southwestern cosmos | |
| Collinsia parviflora | Maiden blue eyed Mary Maiden Blue-eyed Mary | |
| Collinsia sparsiflora | Spinster's blue eyed Mary | |
| Collinsia tinctoria | Sticky Chinese houses | |
| Collinsia torreyi | Torrey's blue eyed Mary | |
| Coreopsis tripteris | Tall tickseed Tall coreopsis | |
| Collinsia verna | Spring blue eyed Mary Spring Blue-eyed Mary | |
| Crataegus aestivalis | Mayhaw May hawthorn | |
| Crataegus brainerdii | Brainerd's hawthorn | |
| Crataegus chrysocarpa | Fireberry hawthorn | |
| Crataegus chrysocarpa var. piperi | Piper's hawthorn Columbia Hawthorn | |
| Crataegus crus-galli | Cockspur hawthorn Cockspur thorn Newcastle hawthorn Newcastle thorn | |
| Crataegus dilatata | Broadleaf hawthorn | |
| Crataegus douglasii | Black hawthorn | |
| Crataegus dodgei | Dodge's hawthorn Dodge hawthorn | |
| Crataegus erythropoda | Cerro hawthorn | |
| Crataegus flabellata | Fanleaf hawthorn | |
| Crataegus flava | Summer hawthorn Yellow-leaf hawthorn Yellowleaf hawthorn | |
| Crataegus greggiana | Gregg's hawthorn | |
| Crataegus holmesiana | Holmes' hawthorn | |
| Crataegus intricata | Copenhagen hawthorn Thicket hawthorn White hawthorn White thorn Scarlet hawthorn Scarlet haw Scarlet-fruited hawthorn Scarlet-fruited haw | |
| Crataegus jonesiae | Miss Jones' hawthorn | |
| Crataegus macrosperma | Bigfruit hawthorn Large-seeded hawthorn | |
| Crataegus marshallii | Parsley hawthorn | |
| Crataegus mollis | Downy hawthorn White thorn Whitethorn Scarlet hawthorn Scarlet haw | |
| Crataegus opaca | Mayhaw Riverflat hawthorn Western mayhaw | |
| Crataegus phaenopyrum | Washington hawthorn Washington-thorn | |
| Crataegus pruinosa | Waxyfruit hawthorn | |
| Crataegus punctata | Dotted hawthorn White thorn Dotted haw | |
| Crataegus reverchonii | Reverchon hawthorn Reverchon's hawthorn | |
| Crataegus rivularis | River hawthorn | |
| Crataegus ×rubrocarnea | ||
| Crataegus scabrida | Rough hawthorn | |
| Crataegus spathulata | Littlehip hawthorn Pasture haw | |
| Crataegus submollis | Quebec hawthorn | |
| Crataegus suborbiculata | Caughuawaga hawthorn | |
| Crataegus succulenta | Fleshy hawthorn | |
| Crataegus sutherlandensis | Sutherland hawthorn Spiny sutherland hawthorn | |
| Crataegus texana | Texas hawthorn | |
| Crataegus tracyi | Mountain Hawthorn Tracy Hawthorn Tracy's hawthorn | |
| Crataegus turnerorum | Turner's hawthorn | |
| Crataegus uniflora | Dwarf hawthorn One-flowered Hawthorn | |
| Crataegus viridis | Green hawthorn Southern thorn | |
| Crataegus viridis var. desertorum | Desert hawthorn Smooth western hawthorn Green hawthorn | |
| Cylindropuntia acanthocarpa var. acanthocarpa | Buckhorn cholla Staghorn cholla | |
| Cylindropuntia bigelovii | Teddybear cholla | |
| Cylindropuntia fulgida var. fulgida | Jumping cholla | |
| Cylindropuntia imbricata | Tree cholla Walking stick cholla Cholla | |
| Cylindropuntia imbricata var. argentea | Tree cholla | |
| Cylindropuntia imbricata var. imbricata | Cane cactus Cholla Teddy-bear cholla Tree cholla Walkingstick cholla | |
| Cylindropuntia leptocaulis | Christmas cactus Christmas cholla Desert Christmas cactus Pencil cactus Tasajillo | |
| Cylindropuntia spinosior | Walkingstick cactus | |
| Cylindropuntia tunicata | Thistle cholla | |
| Cylindropuntia whipplei | Whipple cholla | |
| Dalea aurea | Golden dalea Golden prairie clover | |
| Dalea bicolor var. argyrea | Silver prairie clover Silver dalea Silver bush dalea | |
| Dalea candida | White prairie clover | |
| Dalea candida var. candida | White prairie clover White prairie-clover | |
| Dalea compacta | Compact prairie clover | |
| Dalea compacta var. pubescens | Compact prairie clover | |
| Dalea emarginata | Wedgeleaf prairie clover | |
| Dalea enneandra | Nine-anther prairie clover | |
| Dalea feayi | Feay's prairie clover Globe-headed Prairie Clover | |
| Dalea formosa | Feather dalea Featherplume | |
| Dalea frutescens | Black dalea Black prairie clover | |
| Dasiphora fruticosa ssp. floribunda | Shrubby cinquefoil Golden-hardhack | |
| Dalea greggii | Gregg dalea Gregg's prairie clover Trailing indigo bush Indigo bush | |
| Dalea hallii | Hall's prairie clover Hall’s Dalea | |
| Dalea jamesii | James's prairie clover | |
| Dalea lachnostachys | Glandleaf prairie clover | |
| Dalea lanata | Woolly prairie clover | |
| Dalea lasiathera | Purple dalea | |
| scientific name | common name(s) | image gallery |