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| scientific name | common name(s) | image gallery |
| Acalypha radians | Cardinal's feather Cardinal feather | |
| Acalypha rhomboidea | Common threeseed mercury Virginia threeseed mercury | |
| Acalypha setosa | Cuban Copperleaf | |
| Acalypha virginica | Virginia threeseed mercury | |
| Acamptopappus shockleyi | Shockley's goldenhead | |
| Acanthocereus tetragonus | Triangle Cactus Barbed-wire Cactus Chaco | |
| Acer barbatum | Southern sugar maple Florida maple Caddo maple Rock maple | |
| Acer circinatum | Oregon vine maple Vine maple | |
| Acer glabrum | Rocky Mountain maple | |
| Acer glabrum var. douglasii | Douglas maple | |
| Acer glabrum var. neomexicanum | New Mexico maple | |
| Acer grandidentatum | Bigtooth maple Big-toothed maple Canyon maple | |
| Acer leucoderme | Chalk maple | |
| Acer macrophyllum | Bigleaf maple Big-leaf maple | |
| Acer negundo | Ash-leaf maple Ash-leaved maple Box elder Boxelder Fresno de guajuco | |
| Acer nigrum | Black maple | |
| Acer pensylvanicum | Striped maple Moosewood | |
| Acer rubrum | Red maple Scarlet maple | |
| Acer rubrum var. drummondii | Drummond's maple Drummond red maple Swamp maple | |
| Acer rubrum var. rubrum | Red maple | |
| Acer rubrum var. trilobum | Trident maple Trident red maple | |
| Acer saccharinum | Silver maple Soft maple White maple | |
| Acer saccharum | Sugar maple Northern sugar maple | |
| Acer saccharum var. saccharum | Sugar maple | |
| Acer spicatum | Mountain maple | |
| Achillea millefolium | Common yarrow Yarrow Milfoil Western yarrow | |
| Achillea millefolium var. arenicola | Common yarrow Northern yarrow | |
| Achillea millefolium var. borealis | Boreal Yarrow | |
| Achillea millefolium var. occidentalis | Western yarrow Woolly yarrow White yarrow | |
| Achillea sibirica | Siberian yarrow | |
| Achlys triphylla | Sweet after death Sweet-after-death Vanilla leaf | |
| Achnatherum coronatum | Giant rice grass Giant ricegrass Needle-and-thread grass | |
| Achnatherum hymenoides | Indian ricegrass Indian Millet Sandgrass | |
| Achnatherum lettermanii | Letterman's needlegrass | |
| Achnatherum lobatum | Lobed Needlegrass Littleawn Needlegrass | |
| Achnatherum nelsonii ssp. dorei | Columbia needlegrass Dore's needlegrass | |
| Achnatherum richardsonii | Richardson's needlegrass | |
| Achnatherum robustum | Sleepygrass | |
| Achnatherum speciosum | Desert needlegrass Desert rice grass Spear grass | |
| Achyrachaena mollis | Blow wives | |
| Acleisanthes acutifolia | Needletip trumpets | |
| Acleisanthes longiflora | Angel trumpets Angel's trumpets | |
| Acleisanthes obtusa | Berlandier's trumpets Vine four o'clock | |
| Acleisanthes wrightii | Wright's trumpets | |
| Acmella oppositifolia var. repens | Oppositeleaf spotflower Opposite-leaf spotflower | |
| Acoelorraphe wrightii | Everglades palm | |
| Aconitum columbianum | Columbian monkshood | |
| Aconitum delphiniifolium | Larkspur-leaf monkshood Larkspurleaf monkshood Northern monkshood | |
| Aconitum noveboracense | Northern blue monkshood New York monkshood | |
| Aconitum uncinatum | Southern blue monkshood Monkshood | |
| scientific name | common name(s) | image gallery |