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A single occurrence of, say, purple loosestrife, does not an invasion make.

Purple loosestrife, an invasive flowering plant, is sprouting up - a problem that Rothman said will be resolved by galerucella beetles that were released in the area in the 1990s and that eat purple loosestrife.

Purple loosestrife, an invasive flowering plant, is sprouting up — a problem that Rothman said will be resolved by galerucella beetles that were released in the area in the 1990s and that eat purple loosestrife.

However, every plant depicted, from purple loosestrife to wild roses, is the product of more than three months of painstaking observation as Millais worked on the banks of the Hogsmill River in Surrey.

It is closely related to purple loosestrife, which is native to Europe and Asia and is invasive in Vermont.