Giant hogweed. Heracleum mantegazzianum. Giant hogweed in bloom | Image Details.
Poison hemlock. Conium maculatum. Poison hemlock in bloom | Image Details.
Spotted water hemlock. Cicuta maculata.
Cow parsnip. Heracleum maximum.
Wild parsnip. Pastinaca sativa.
Queen Anne's lace. Daucus carota.