UMass Extension Weed Herbarium
| Common Name | Scientific Name | Family Name | |
|---|---|---|---|
| stiltgrass, Japanese | Microstegium vimineum | Poaceae (Graminae) - Grass Family | |
| stinkgrass | Eragrostis cilianensis | Poaceae (Graminae) - Grass Family | |
| stinkhorn | see - jimsonweed | ||
| stinking Willie | see - ragwort, tansy | ||
| stinkweed | see - jimsonweed | ||
| stitchwort | see - little starwort | ||
| stoneroot | see - horsebalm | ||
| storksbill | see - filaree, redstem | ||
| strawberry, wild | Fragaria virginiana | Rosaceae - Rose Family | |
| succory | see - chicory | ||
| sumac, smooth | Rhus glabra | Anacardiaceae - Cashew Family | |
| sumac, staghorn | Rhus typhina | Anacardiaceae - Cashew Family | |
| swallowwort, black | Cynanchum nigrum | Asclepiadaceae - Milkweed Family | |
| swallowwort, pale | Cynanchum rossicum | Asclepiadaceae - Milkweed Family | |
| sweet clover, white | Melilotus alba | Fabaceae (Leguminosae) - Pea or Bean Family | |
| sweet clover, yellow | Melilotus officinalis | Fabaceae (Leguminosae) - Pea or Bean Family | |
| sweet jarvil | see - cicely, sweet | ||
| sweet pea | see - peavine, everlasting | ||
| switchgrass | Panicum virgatum | Poaceae (Graminae) - Grass Family |