Weed Herbarium – by Scientific Name
| Abutilon theophrasti | velvetleaf | Malvaceae - Mallow Family |
| Acalypha rhomboidea | rhombic copper-leaf | Euphorbiaceae - Spurge Family |
| Achillea millefolium | yarrow | Asteraceae (Compositae) - Aster or Sunflower Family |
| Actinomeris alternifolia | see - Verbesina alternifolia |
| Aegopodium podagraria | bishops goutweed | Apiaceae (Umbelliferae) - Carrot Family |
| Ageratina altissima | see - Eupatorium rugosum |
| Agrimonia gryposepala | agrimony | Rosaceae - Rose Family |
| Agropyron repens | see - Elytrigia repens |
| Agrostis palustris | see - Agrostis stolonifera | |
| Agrostis stolonifera | creeping bentgrass | Poaceae (Graminae) - Grass Family |
| Ailanthus altissima | tree-of-Heaven | Simaroubaceae - Quassia Family |
| Akebia quinata | five-leaf akebia | Lardizabalaceae - Lardizabala Family |
| Alliaria petiolata | garlic mustard | Brassicaceae (Cruciferae) - Mustard Family |
| Allium vineale | wild garlic | Liliaceae - Lily Family |
| Alopecurus pratensis | meadow foxtail | Poaceae (Graminae) - Grass Family |
| Amaranthus lividus | livid pigweed | Amaranthaceae - Amaranth Family |
| Amaranthus retroflexus | redroot pigweed | Amaranthaceae - Amaranth Family |
| Amaranthus spinosus | spiny amaranth | Amaranthaceae - Amaranth Family |
| Ambrosia artemisiifolia | common ragweed | Asteraceae (Compositae) - Aster or Sunflower Family |
| Ambrosia trifida | giant ragweed | Asteraceae (Compositae) - Aster or Sunflower Family |
| Ampelopsis brevipedunculata | porcelainberry | Vitaceae - Grape Family |
| Amphicarpaea bracteata | hog-peanut | Fabaceae (Leguminosae) - Pea or Bean Family |
| Anagallis arvensis | scarlet pimpernel | Primulaceae - Primrose Family |
| Anaphalis margaritacea | pearly-everlasting | Asteraceae (Compositae) - Aster or Sunflower Family |
| Andropogon gerardii | big bluestem | Poaceae (Graminae) - Grass Family |
| Andropogon scoparius | little bluestem | Poaceae (Graminae) - Grass Family |
| Angelica atropurpurea | purplestem angelica | Apiaceae (Umbelliferae) - Carrot Family |
| Anoda cristata | spurred anoda | Malvaceae - Mallow Family |
| Antennaria neglecta | field pussytoes | Asteraceae (Compositae) - Aster or Sunflower Family |
| Anthoxanthum odoratum | sweet vernalgrass | Poaceae (Graminae) - Grass Family |
| Apios americana | groundnut | Fabaceae (Leguminosae) - Pea or Bean Family |
| Apocynum androsaemifolium | spreading dogbane | Apocynaceae - Dogbane Family |
| Apocynum cannabinum | hemp dogbane | Apocynaceae - Dogbane Family |
| Arabidopsis thaliana | mouse-ear cress | Brassicaceae (Cruciferae) - Mustard Family |
| Arabis glabra | tower mustard | Brassicaceae (Cruciferae) - Mustard Family |
| Aralia spinosa | devil's walkingstick | Araliaceae - Aralia Family |
| Arctium lappa | great burdock | Asteraceae (Compositae) - Aster or Sunflower Family |
| Arctium minus | common burdock | Asteraceae (Compositae) - Aster or Sunflower Family |
| Arenaria serpyllifolia | thymeleaf sandwort | Caryophyllaceae - Pink Family |
| Artemisia vulgaris | mugwort | Asteraceae (Compositae) - Aster or Sunflower Family |
| Asclepias incarnata | swamp milkweed | Asclepiadaceae - Milkweed Family |
| Asclepias syriaca | common milkweed | Asclepiadaceae - Milkweed Family |
| Aster acuminatus | see - Oclemena acuminata | |
| Aster divaricatus | white wood aster | Asteraceae (Compositae) - Aster or Sunflower Family |
| Barbarea vulgaris | yellow rocket | Brassicaceae (Cruciferae) - Mustard Family |
| Bassia scoparia | see - Kochia scoparia |
| Bellis perennis | english daisy | Asteraceae (Compositae) - Aster or Sunflower Family |
| Berteroa incana | hoary alyssum | Brassicaceae (Cruciferae) - Mustard Family |
| Bidens frondosa | beggarticks | Asteraceae (Compositae) - Aster or Sunflower Family |
| Brassica arvensis | see - Brassica kaber |