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Norway Maple
Acer platanoides
Norway maples produce large numbers of seeds which can be widely dispersed due to their winged samaras.
Oriental Bittersweet
Celastrus orbiculatus
Oriental, or asiatic, bittersweet is a perennial, deciduous vine that can grow up to 60 ft. Its stems have dark brown, striated bark. The alternate leaves are elliptic to ovate, and spiral evenly around the stem. Axillary flowers bloom in May to early June yielding bright, reddish-orange fruit in the fall. Oriental bittersweet can be confused with american bittersweet, a native species, which has terminal inflorescence and orange capsules
Parrot Feather Watermilfoil
Myriophyllum aquaticum
Parrot feather is an aquatic perennial species named for its bright green, feather-like appearance.
Poison Hemlock
Conium maculatum
Poison hemlock is biennial herbaceous plant that grows as a rosette in the first year and grows a tall flower stalk in the second. Its fern-like leaves are at least 2 feet long and pinnately compound. The stem is hairless, hollow and speckled with purple.
Policemen’s Helmet, Himalayan Balsam
Impatiens glandulifera
Policemen's helmet is an annual herb that produces irregularly shaped, pink to purple colored flowers. Similar to other ‘touch-me-not’ species, this plant produces fruit that bursts at maturity when disturbed.
Porcelain Berry
Ampelopsis glandulosa
Porcelain berry is a perennial, deciduous vine that can grow up to 20 feet long. It produces small greenish-yellow flowers that develop into hard berries in various shades that mature to a bright blue.
Purple Loosestrife
Lythrum salicaria
Purple loosestrife is an erect, herbaceous perennial that grows 3-7 ft. tall. It is easily identified by its showy, magenta flowers from July to September. Linear-shaped leaves grow oppositely along square stems. This aggressive plant spreads both vegetatively and by abundant seed dispersal.
Quagga Mussel
Dreissena bugensis
The quagga mussel is a filter-feeding, freshwater, bivalve mollusk. It is pale toward the end of its hinge and about 3/4" wide.