UMass Extension Weed Herbarium
| Common Name | Scientific Name | Family Name | |
|---|---|---|---|
| jacob's-ladder | see - carrion flower | ||
| jamestownweed | see - jimsonweed | ||
| Jerusalem artichoke | Helianthus tuberosus | Asteraceae (Compositae) - Aster or Sunflower Family | |
| jewelweed | see - touch-me-not, spotted | ||
| jewelweed, pale | see - touch-me-not, pale | ||
| jewgrass | see - stiltgrass, Japanese | ||
| jimsonweed | Datura stramonium | Solanaceae - Nightshade Family | |
| Joe-pye weed, eastern | Eupatorium dubium | Asteraceae (Compositae) - Aster or Sunflower Family | |
| Joe-pye weed, hollow-stemmed | Eupatorium fistulosum | Asteraceae (Compositae) - Aster or Sunflower Family | |
| Joe-pye weed, purple-node | see - Joe-pye weed, sweet | ||
| Joe-pye weed , purple-stem | see - Joe-pye weed, sweet | ||
| Joe-pye weed, spotted | Eupatorium maculatum | Asteraceae (Compositae) - Aster or Sunflower Family | |
| Joe-pye weed, sweet | Eupatorium purpureum | Asteraceae (Compositae) - Aster or Sunflower Family | |
| Joe-pye weed, sweet-scented | see - Joe-pye weed, sweet | ||
| johnny-jump-ups | see - violet, common blue | ||
| Johnson grass | Sorghum halepense | Poaceae (Graminae) - Grass Family | |
| jumpseed | see - knotweed, Virginia |