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| scientific name | common name(s) | image gallery |
| 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 linaria | Pineneedle milkweed Needle-Leaf Milkweed | |
| Asclepias linearis | Slim milkweed | |
| Asclepias longifolia | Longleaf milkweed | |
| Asclepias michauxii | Michaux's Milkweed | |
| Asclepias nummularia | Tufted 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 | |
| Asimina angustifolia | Slimleaf pawpaw | |
| Asimina obovata | Bigflower pawpaw Florida dogwood Scrub Pawpaw Flag pawpaw | |
| Asimina parviflora | Smallflower pawpaw Small-flower pawpaw Dwarf pawpaw | |
| Asimina pygmea | Dwarf pawpaw Gopher-berry | |
| Asimina reticulata | Netted pawpaw Woolly pawpaw Hairy pawpaw | |
| Asimina triloba | Pawpaw Common paw paw Indian banana | |
| Aspicarpa hyssopifolia | Hyssopleaf asphead | |
| Aspidotis densa | Cliff brake Indian's dream Rock brake | |
| Asplenium platyneuron | Ebony spleenwort | |
| Asplenium resiliens | Blackstem spleenwort | |
| Asplenium rhizophyllum | Walking fern | |
| Asplenium ruta-muraria | Wallrue | |
| Asplenium scolopendrium var. americanum | American hart's-tongue fern | |
| Asplenium septentrionale | Forked Spleenwort Grassfern | |
| Asplenium trichomanes | Maidenhair spleenwort | |
| Asplenium trichomanes ssp. trichomanes | Maidenhair spleenwort | |
| Asplenium trichomanes-ramosum | Brightgreen spleenwort | |
| Aster alpinus | Alpine aster | |
| Astilbe biternata | Appalachian false goat's beard False goatsbeard | |
| Astragalus accidens | Rogue River milkvetch | |
| Astragalus agrestis | Field Milk-vetch Purple milkvetch | |
| Astragalus albulus | Cibola milkvetch | |
| Astragalus alpinus | Alpine milkvetch | |
| Astragalus alpinus var. alpinus | Alpine milkvetch | |
| Astragalus alpinus var. brunetianus | Alpine milkvetch | |
| Astragalus americanus | American milk-vetch American milkvetch Rattlepod | |
| Astragalus amphioxys | Crescent milkvetch Crescent milk-vetch | |
| Astragalus asclepiadoides | Milkweed milkvetch | |
| Astragalus atratus var. mensanus | Mourning milkvetch | |
| Astragalus australis | Indian milkvetch | |
| Astragalus bisulcatus | Twogrooved milkvetch | |
| Astragalus calycosus | Torrey's milkvetch | |
| Astragalus canadensis | Canadian milkvetch Canada milkvetch Milk vetch | |
| Astragalus ceramicus | Painted milkvetch | |
| Astragalus chamaeleuce | Cicada milkvetch | |
| Astragalus coccineus | Scarlet Locoweed Scarlet milkvetch | |
| Astragalus crassicarpus | Groundplum milkvetch Ground plum | |
| Astragalus crassicarpus var. berlandieri | Groundplum Milkvetch Groundplum Berlandier's Groundplum | |
| Astragalus crassicarpus var. crassicarpus | Groundplum Milkvetch | |
| Astragalus crotalariae | Salton milkvetch Salton Sea Milk Vetch | |
| Astragalus didymocarpus | Dwarf white milkvetch | |
| Astragalus distortus | Ozark milkvetch Bent milk vetch Bentpod milkvetch | |
| Astragalus drummondii | Drummond's milkvetch | |
| Astragalus emoryanus | Emory's milkvetch | |
| Astragalus eucosmus | Elegant milkvetch | |
| Astragalus flexuosus | Flexile milkvetch | |
| Astragalus giganteus | Giant milkvetch | |
| Astragalus gracilis | Slender milkvetch | |
| Astragalus inflexus | Bent Milk-vetch Bent milkvetch | |
| Astragalus kentrophyta | Spiny milkvetch | |
| Astragalus laxmannii var. robustior | Prairie milkvetch | |
| Astragalus lentiginosus | Freckled milkvetch | |
| Astragalus leptocarpus | Rare loco milkvetch Slimpod milkvetch | |
| Astragalus lindheimeri | Lindheimer's milkvetch Lindheimer’s astragulus | |
| Astragalus lotiflorus | Lotus milkvetch Lotus milk-vetch Low milkvetch Milkvetch | |
| Astragalus missouriensis | Missouri milkvetch | |
| Astragalus mollissimus | Purple locoweed Woolly loco Woolly locoweed Woolly milkvetch Wooly loco Wooly locoweed | |
| Astragalus newberryi | Newberry's milkvetch | |
| Astragalus nuttallianus | Nuttall's milkvetch Small-flowered milkvetch | |
| Astragalus parryi | Parry's milkvetch | |
| Astragalus pectinatus | Narrowleaf milkvetch | |
| Astragalus plattensis | Platte River milkvetch | |
| Astragalus pleianthus | Edwards Plateau milkvetch | |
| scientific name | common name(s) | image gallery |