UMass Extension Weed Herbarium
| Common Name | Scientific Name | Family Name | |
|---|---|---|---|
| campion, white | see - cockle, white | ||
| canary grass, reed | Phalaris arundinacea | Poaceae (Graminae) - Grass Family | |
| candlewicks | see - mullein, common | ||
| carelessweed | see - pigweed, redroot | ||
| carpenter's square | see - figwort, common | ||
| carpetweed | Mollugo verticillata | Aizoaceae - Carpetweed Family | |
| carrion flower | Smilax herbacea | Smilacaceae - Catbrier Family | |
| carrion vine | see - carrion flower | ||
| carrot, wild | Daucus carota | Apiaceae (Umbelliferae) - Carrot Family | |
| cat's ear | Hypochaeris radicata | Asteraceae (Compositae) - Aster or Sunflower Family | |
| cat's ear, spotted | see - cat's ear | ||
| catchweed | see - bedstraw, catchweed | ||
| cattail, common | Typha latifolia | Typhaceae - Cattail Family | |
| celadine, lesser | Ranunculus ficaria | Ranunculaceae - Buttercup Family | |
| celandine, greater | Chelidonium majus | Papaveraceae - Poppy Family | |
| chamomile, rayless | see - pineappleweed | ||
| charlock | see - mustard, wild | ||
| cheatgrass | see - brome, downy | ||
| cheeses | see - mallow, common | ||
| chickweed, common | Stellaria media | Caryophyllaceae - Pink Family | |
| chickweed, Indian | see - carpetweed | ||
| chickweed, mouse-ear | Cerastium vulgatum | Caryophyllaceae - Pink Family | |
| chickweed, red | see - pimpernel, scarlet | ||
| chickweed, sticky | Cerastium glomeratum | Caryophyllaceae - Pink Family | |
| chicory | Cichorium intybus | Asteraceae (Compositae) - Aster or Sunflower Family | |
| chocolate vine | see - akebia, five-leaf | ||
| chrysanthemum, wild | see - mugwort | ||
| chufa | see - nutsedge, yellow | ||
| church steeples | see - agrimony | ||
| cicely, smoother sweet | see - aniseroot | ||
| cicely, sweet | Osmorhiza claytoni | Apiaceae (Umbelliferae) - Carrot Family | |
| cicely, woolly sweet | see - cicely, sweet | ||
| cinquefoil, common | see - cinquefoil, old field | ||
| cinquefoil, old field | Potentilla simplex | Rosaceae - Rose Family | |
| cinquefoil, rough | Potentilla norvegica | Rosaceae - Rose Family | |
| cinquefoil, round-fruited | see - cinquefoil, sulfur | ||
| cinquefoil, silvery | Potentilla argentea | Rosaceae - Rose Family | |
| cinquefoil, sulfur | Potentilla recta | Rosaceae - Rose Family | |
| clearweed | Pilea pumila | Urticaceae - Nettle Family | |
| cleavers | see - bedstraw, catchweed | ||
| clematis, wild | see - virgin's bower | ||
| clover, alsike | Trifolium hybridum | Fabaceae (Leguminosae) - Pea or Bean Family | |
| clover, Dutch | see - clover, white | ||
| clover, old field | see - clover, rabbitfoot | ||
| clover, purple | see - clover, red | ||
| clover, rabbitfoot | Trifolium arvense | Fabaceae (Leguminosae) - Pea or Bean Family | |
| clover, red | Trifolium pratense | Fabaceae (Leguminosae) - Pea or Bean Family | |
| clover, stone | see - clover, rabbitfoot | ||
| clover, white | Trifolium repens | Fabaceae (Leguminosae) - Pea or Bean Family | |
| cockle, white | Silene alba | Caryophyllaceae - Pink Family |