Invasive Plants
The Massachusetts Department of Agricultural Resources maintains the MA Prohibited Plants List, which prohibits the sale, trade, and importation of the listed species.
The Invasive Plant Atlas of New England is a useful database of invasive (or potentially invasive) plants in the New England region. IPANE provides searchable results that include images, descriptions, and distribution maps.
Mass Audubon also provides images and descriptions of some common invasive plants.