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| scientific name | common name(s) | image gallery |
| Agastache foeniculum | Blue giant hyssop Blue giant-hyssop Fragrant giant hyssop Lavender hyssop Anise hyssop | |
| Agastache nepetoides | Yellow giant hyssop | |
| Agastache scrophulariifolia | Purple giant hyssop Purple giant-hyssop | |
| Agastache urticifolia | Nettleleaf giant hyssop Nettle-leaf Horsemint | |
| Asclepias albicans | White-stemmed Milkweed Whitestem milkweed | |
| Asclepias amplexicaulis | Clasping milkweed | |
| Astragalus americanus | American milk-vetch American milkvetch Rattlepod | |
| Asclepias arenaria | Sand milkweed | |
| Asclepias asperula | Spider milkweed Antelope horns Green-flowered milkweed Spider antelope-horns | |
| Asclepias asperula ssp. capricornu | Antelopehorns Antelope horns | |
| Asclepias brachystephana | Bract milkweed | |
| Astragalus canadensis | Canadian milkvetch Canada milkvetch Milk vetch | |
| Asclepias californica | California milkweed | |
| Asclepias cryptoceras | Pallid Milkweed Humboldt Mountain Milkweed | |
| Asclepias engelmanniana | Engelmann's milkweed | |
| Asclepias eriocarpa | Woollypod milkweed | |
| Asclepias exaltata | Poke milkweed | |
| Asclepias fascicularis | Mexican whorled milkweed Narrowleaf milkweed | |
| Asclepias hirtella | Green milkweed | |
| Asclepias humistrata | Pinewoods milkweed Sandhill milkweed | |
| Asclepias incarnata | Swamp milkweed Pink Milkweed | |
| Asclepias incarnata ssp. incarnata | Swamp milkweed | |
| Asclepias incarnata ssp. pulchra | Swamp milkweed | |
| Asclepias lanceolata | Fewflower milkweed Few-flower milkweed Red milkweed | |
| Asclepias latifolia | Broadleaf milkweed | |
| Asclepias linearis | Slim milkweed | |
| Asclepias linaria | Pineneedle milkweed Needle-Leaf Milkweed | |
| Asclepias longifolia | Longleaf milkweed | |
| Asclepias michauxii | Michaux's Milkweed | |
| Asclepias obovata | Pineland Milkweed | |
| Asclepias oenotheroides | Zizotes milkweed Hierba de Zizotes Longhorn milkweed Side-cluster milkweed Primrose milkweed Lindheimer's milkweed | |
| Asclepias ovalifolia | Oval-leaf milkweed Dwarf milkweed | |
| Asclepias perennis | Aquatic milkweed | |
| Asclepias purpurascens | Purple milkweed | |
| Asclepias quadrifolia | Fourleaf milkweed | |
| Asclepias rubra | Red Milkweed Tall Pink Bog Milkweed | |
| Asclepias speciosa | Showy milkweed | |
| Asclepias stenophylla | Slimleaf Milkweed Narrowleaf Milkweed Narrowleaf Green Milkweed | |
| Asclepias subulata | Rush milkweed Desert milkweed Ajamete | |
| Asclepias subverticillata | Horsetail milkweed Poison Milkweed | |
| Asclepias sullivantii | Prairie milkweed Sullivant's milkweed Smooth milkweed | |
| Asclepias syriaca | Common milkweed | |
| Asclepias texana | Texas milkweed White milkweed | |
| Asclepias tomentosa | Tuba milkweed | |
| Asclepias tuberosa | Butterflyweed Butterfly milkweed Orange milkweed Pleurisy root | |
| Asclepias variegata | Redring milkweed White-flowered milkweed | |
| Asclepias verticillata | Whorled milkweed Eastern whorled milkweed | |
| Asclepias viridiflora | Green milkweed Green comet milkweed Green antelopehorn milkweed | |
| Asclepias viridis | Green antelopehorn Green milkweed | |
| Baptisia alba | White wild indigo | |
| Baptisia alba var. macrophylla | Largeleaf wild indigo White wild indigo | |
| Baptisia australis | Blue wild indigo Wild blue indigo Blue false indigo | |
| Baptisia australis var. minor | Blue Wild Indigo | |
| Baptisia bracteata | Longbract wild indigo | |
| Baptisia bracteata var. laevicaulis | Longbract wild indigo | |
| Baptisia bracteata var. leucophaea | Longbract wild indigo Cream false indigo Plains wild indigo Cream wild indigo Large-bracted wild indigo | |
| Baptisia lanceolata | Gopherweed Pineland baptisia | |
| Baptisia nuttalliana | Nuttall's wild indigo | |
| Balsamorhiza sagittata | Arrowleaf balsamroot Arrow-leaf balsamroot | |
| Baptisia sphaerocarpa | Bush pea Green wild indigo Yellow wild indigo Yellow wisteria | |
| Baptisia tinctoria | Horseflyweed Yellow Wild Indigo | |
| Blephilia ciliata | Downy pagoda plant Sunny woodmint Ohio horsemint | |
| Cercis canadensis | Eastern redbud Redbud | |
| Cercis canadensis var. canadensis | Eastern redbud | |
| Cercis canadensis var. mexicana | Mexican redbud | |
| Cercis canadensis var. texensis | Texas redbud | |
| Ceanothus griseus | Carmel ceanothus Carmel creeper Yankee Point ceanothus | |
| Cephalanthus occidentalis | Common buttonbush Buttonbush Button willow | |
| Cercis orbiculata | California redbud Western redbud Arizona redbud Pata de vaca | |
| Ceanothus tomentosus | Woolyleaf ceanothus Woolly-leaf mountain lilac Ramona lilac | |
| Chamaecrista fasciculata | Partridge pea Sleepingplant Sensitive plant | |
| Chamaecrista fasciculata var. fasciculata | Partridge pea Showy Partridge-pea Beeflower | |
| Cirsium arizonicum | Arizona thistle | |
| Cirsium brevistylum | Clustered thistle Indian thistle Short-style thistle | |
| Cirsium canescens | Prairie thistle | |
| Cirsium cymosum | Peregrine thistle | |
| Cirsium discolor | Field thistle | |
| Cirsium drummondii | Dwarf thistle | |
| Cirsium edule | Edible thistle | |
| Cirsium engelmannii | Engelmann's thistle | |
| Cirsium flodmanii | Flodman's thistle | |
| Cirsium foliosum | Elk thistle | |
| Cirsium horridulum | Yellow thistle | |
| Cirsium mohavense | Mojave thistle | |
| Cirsium muticum | Swamp thistle | |
| Cirsium neomexicanum | New Mexico thistle Utah thistle | |
| Cirsium occidentale | Cobwebby thistle | |
| Cirsium ochrocentrum | Yellowspine thistle | |
| Cirsium occidentale var. candidissimum | Snowy thistle | |
| Cirsium occidentale var. occidentale | Cobwebby thistle | |
| Cirsium peckii | Steen Mountain thistle Ghost thistle | |
| Cirsium pitcheri | Sand dune thistle | |
| Cirsium pumilum | Pasture thistle | |
| Cirsium scariosum | Meadow thistle | |
| Cirsium texanum | Texas thistle | |
| Cirsium turneri | Cliff thistle | |
| Cirsium undulatum | Wavyleaf thistle Plumed Thistle | |
| Cirsium wheeleri | Wheeler's thistle | |
| Clethra acuminata | Mountain sweet pepperbush Cinnamon clethra | |
| Clethra alnifolia | Coastal sweet pepperbush Clethra Summer sweet | |
| scientific name | common name(s) | image gallery |