Weed Herbarium – by Scientific Name
| Brassica kaber | wild mustard | Brassicaceae (Cruciferae) - Mustard Family |
| Bromus inermis | smooth brome | Poaceae (Graminae) - Grass Family |
| Bromus tectorum | downy brome | Poaceae (Graminae) - Grass Family |
| Calystegia sepium | hedge bindweed | Convolvulaceae - Morningglory Family |
| Capsella bursa-pastoris | shepherd's-purse | Brassicaceae (Cruciferae) - Mustard Family |
| Cardamine hirsuta | bittercress | Brassicaceae (Cruciferae) - Mustard Family |
| Cardamine pratensis | cuckoo bittercress | Brassicaceae (Cruciferae) - Mustard Family |
| Carduus arvensis | see - Cirsium arvense |
| Carduus vulgare | see - Cirsium vulgare |
| Celastrus orbiculatus | oriental bittersweet | Celastraceae - Stafftree Family |
| Cenchrus longispinus | longspine sandbur | Poaceae (Graminae) - Grass Family |
| Centaurea maculosa | spotted knapweed | Asteraceae (Compositae) - Aster or Sunflower Family |
| Cerastium fontanum | see - Cerastium vulgatum | |
| Cerastium viscosum | see - Cerastium glomeratum | |
| Cerastium glomeratum | sticky chickweed | Caryophyllaceae - Pink Family |
| Cerastium vulgatum | mouse-ear chickweed | Caryophyllaceae - Pink Family |
| Chamaesyce maculata | see - Euphorbia maculata |
| Chelidonium majus | greater celandine | Papaveraceae - Poppy Family |
| Chenopodium album | common lambsquarters | Chenopodiaceae - Goosefoot Family |
| Chenopodium ambrosioides | wormseed Mexicantea | Chenopodiaceae - Goosefoot Family |
| Chenopodium pumilio | clammy goosefoot | Chenopodiaceae - Goosefoot Family |
| Chrysanthemum leucanthemum | oxeye daisy | Asteraceae (Compositae) - Aster or Sunflower Family |
| Cichorium intybus | chicory | Asteraceae (Compositae) - Aster or Sunflower Family |
| Cicuta maculata | spotted water hemlock | Apiaceae (Umbelliferae) - Carrot Family |
| Circaea lutetiana | see - Circaea quadrisulcata | |
| Circaea quadrisulcata | enchanter's nightshade | Onagraceae - Evening Primrose Family |
| Cirsium arvense | Canada thistle | Asteraceae (Compositae) - Aster or Sunflower Family |
| Cirsium vulgare | bull thistle | Asteraceae (Compositae) - Aster or Sunflower Family |
| Claytonia virginica | narrowleaf spring beauty | Portulacaceae - Purslane Family |
| Clematis virginiana | virgin's bower | Ranunculaceae - Buttercup Family |
| Collinsonia canadensis | horsebalm | Lamiaceae (Labiatae) - Mint Family |
| Commelia communis | asiatic dayflower | Commelinaceae - Spiderwort Family |
| Convolvulus sepium | see - Calystegia sepium | |
| Convolvulus arvensis | field bindweed | Convolvulaceae - Morningglory Family |
| Conyza canadensis | horseweed | Asteraceae (Compositae) - Aster or Sunflower Family |
| Coronilla varia | trailing crown vetch | Fabaceae (Leguminosae) - Pea or Bean Family |
| Crepis tectorum | narrowleaf hawksbeard | Asteraceae (Compositae) - Aster or Sunflower Family |
| Cuscuta spp. | dodder | Convolvulaceae - Morningglory Family |
| Cymbalaria muralis | Kenilworth ivy | Scrophulariaceae - Figwort Family |
| Cynanchum lousieae | see - Cynanchum nigrum | |
| Cynanchum nigrum | black swallowwort | Asclepiadaceae - Milkweed Family |
| Cynanchum rossicum | pale swallowwort | Asclepiadaceae - Milkweed Family |
| Cyperus esculentus | yellow nutsedge | Cyperaceae - Sedge Family |
| Dactylis glomerata | orchardgrass | Poaceae (Graminae) - Grass Family |
| Datura stramonium | jimsonweed | Solanaceae - Nightshade Family |
| Daucus carota | wild carrot | Apiaceae (Umbelliferae) - Carrot Family |
| Desmodium rotundifolium | prostrate ticktrefoil | Fabaceae (Leguminosae) - Pea or Bean Family |
| Desmodium canadense | hoary tickclover | Fabaceae (Leguminosae) - Pea or Bean Family |
| Dianthus armeria | pink deptford | Caryophyllaceae - Pink Family |
| Dianthus deltoides | pink maiden | Caryophyllaceae - Pink Family |