| Scientific Name | Common Name(s) | Life History | Growth Form | |
|---|---|---|---|---|
|
Acer tataricum ssp. ginnala | Amur Maple | Perennial | tree |
|
Adonis aestivalis | Pheasant's Eye, Summer Adonis, Summer Pheasant's Eye | Annual | forb |
| Aegilops cylindrica | jointed goatgrass | Annual | grass | |
|
Aegopodium podagraria | goutweed, Bishop's goutweed, Bishop weed, ground elder | Perennial | forb |
|
Aegopodium podagraria 'Variegatum' | Bishop's Weed, Snow-on-the-Mountain, Goutweed | Perennial | forb |
|
Aeschynomene rudis | rough jointvetch, rough jointgrass, rough joint-vetch, zigzag jointvetch, Red aeschynomene | Annual | tree |
|
Aesculus glabra | Ohio buckeye, American buckeye, fetid buckeye, Horse chestnut | Perennial | tree |
| Aesculus hippocastanum | horsechestnut | Perennial | tree | |
|
Agapanthus praecox | African lilly | Perennial | forb |
| Agapanthus praecox ssp. minimus 'Peter Pan' | Lily of the nile, African lily | Perennial | shrub | |
|
Ailanthus altissima | tree of heaven, ailanthus, Chinese sumac, stinking shumac | Perennial | tree |
|
Aira praecox | European hairgrass, yellow hairgrass, early hair grass, spike hairgrass | Annual | grass |
|
Ajuga reptans | Bugleweed, Common Bugle | Perennial | forb |
|
Albizia julibrissin | Mimosa, Silk tree | Perennial | tree |
| Alliaria petiolata | garlic mustard | Biennial | forb | |
|
Allium sativum | Garlic | Perennial | forb |
| Allium triquetrum | Three-cornered garlic, Three-cornered leek, Snowbell | Perennial | forb | |
| Allium vineale L. | crow garlic, field garlic, false garlic, wild garlic | Perennial | forb | |
|
Alnus glutinosa | alder, European alder, black alder | Perennial | tree |
|
Alopecurus pratensis | meadow foxtail, golden foxtail grass, perennial foxtail | Perennial | grass |
|
Alyssum murale | yellow-tuft alyssum | Perennial | forb |
| Amaranthus palmeri | Palmer's amaranth, carelessweed, Palmer amaranth, Palmer's pigweed | Annual | forb | |
|
Ambrosia trifida | giant ragweed, bitter-weed, buffalo-weed, crown-weed, great ragweed, horse-weed, king's-head, ragweed, tall ambrosia, wild hemp, blood ragweed, Texan great ragweed, tall ragweed, perennial ragweed, blood ragweed, horseweed, kinghead, buffaloweed, palmate ragweed | Annual | forb |
| Ampelopsis brevipedunculata | Porcelain berry, Wild grape, Amur peppervine | Annual | vine | |
| Ampelopsis brevipedunculata 'Elegans' | Porcelain Berry, Variegated Porcelain Berry | Perennial | vine |