UMass Extension Weed Herbarium
| Common Name | Scientific Name | Family Name | |
|---|---|---|---|
| bluets | Houstonia caerulea | Rubiaceae - Madder Family | |
| blueweed | Echium vulgare | Boraginaceae - Borage Family | |
| boneset | Eupatorium perfoliatum | Asteraceae (Compositae) - Aster or Sunflower Family | |
| bouncing bet | Saponaria officinalis | Caryophyllaceae - Pink Family | |
| bracken fern | Pteridium aquilinum | Polypodiaceae - Fern Family | |
| brome, downy | Bromus tectorum | Poaceae (Graminae) - Grass Family | |
| brome, drooping | see - brome, downy | ||
| brome, smooth | Bromus inermis | Poaceae (Graminae) - Grass Family | |
| broombeard grass | see - bluestem, little | ||
| buckhorn | see - plantain, narrowleaf | ||
| buckwheat, wild | Polygonum convolvulus | Polygonaceae - Smartweed or Buckwheat Family | |
| bugleweed, american | Lycopus americanus | Lamiaceae (Labiatae) - Mint Family | |
| bugloss, viper's | see - blueweed | ||
| burcucumber | Sicyos angulatus | Cucurbitaceae - Gourd Family | |
| burdock, common | Arctium minus | Asteraceae (Compositae) - Aster or Sunflower Family | |
| burdock, great | Arctium lappa | Asteraceae (Compositae) - Aster or Sunflower Family | |
| burnweed, American | see - pilewort | ||
| bush clover, slender | Lespedeza virginica | Fabaceae (Leguminosae) - Pea or Bean Family | |
| butter-and-eggs | see - toadflax, yellow | ||
| butterbur-dock | see - butterburdock | ||
| butterburdock | Petasites hybridus | Asteraceae (Compositae) - Aster or Sunflower Family | |
| buttercup, bulbous | Ranunculus bulbosus | Ranunculaceae - Buttercup Family | |
| buttercup, common | see - buttercup, tall | ||
| buttercup, creeping | Ranunculus repens | Ranunculaceae - Buttercup Family | |
| buttercup, fig | see - celadine, lesser | ||
| buttercup, kidney-leaved | see - buttercup, smallflower | ||
| buttercup, meadow | see - buttercup, tall | ||
| buttercup, smallflower | Ranunculus abortivus | Ranunculaceae - Buttercup Family | |
| buttercup, tall | Ranunculus acris | Ranunculaceae - Buttercup Family | |
| butterprint | see - velvetleaf | ||
| buttonweed | see - velvetleaf | ||
| 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 |