Reward: Healthy Ecosystem in the U.S.
Scientific Name: Lythrum salicaria
Physical Characteristics: 2-7 feet high, 5-6 pinkish purple petals on each flower, smooth green leaves, square-shaped stalks
Habitat: Marshes, bogs, sedge meadows, wet prairies, and sometimes in roadside ditches, on river banks, and at the edges of reservoirs
Biological control: The plant's natural enemy, Galerucella beetles, are introduced into the area to prevent population explosions of purple loosestrife.