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Photo by Randy Westbrooks, U.S. Geological Survey, Bugwood.org
Zebra Mussel

Zebra Mussel

Dreissena polymorpha

Zebra mussels are filter-feeding, freshwater, bivalve mollusks. Zebra mussels are small, ¼” to 1 ½” long, and D-shaped with light and dark brown stripes.

Yellow Floating Heart

Yellow Floating Heart

Nymphoides peltata

Yellow floating heart is an herbaceous perennial that has stout, branching stems. The heart-shaped, almost circular, leaves are usually oppositely arranged and frequently purplish underneath. Bright yellow flowers have 5 petals and distinctively fringed edges. It spreads both vegetatively and by seeds.

Photo by Ray Curran
Yellow Flag Iris

Yellow Flag Iris

Iris pseudacorus

Yellow iris is an herbaceous perennial that can grow between 3-4 ft. The broad, lance-shaped leaves are stiff and erect. The yellow, showy flowers bloom from April to June.

Photo by April Senften
Wild Parsnip

Wild Parsnip

Pastinaca sativa

Wild parsnip is a biennial herb that grows to 2-5 ft. Alternate, compound, branched leaves have serrated edges. First year rosettes have pinnately compound leaves. Adult plants bloom June through August with small, five-petaled, yellow flowers arranged in a flat-topped, broad umbel of 2-6".

Pseudogymnoascus destructans ID, Photo Credit: Al Hicks, NYSDEC,
White Nose Syndrome

White Nose Syndrome

Pseudogymnoascus destructans

White nose syndrome is caused by an invasive (non-native) fungus, Pseudogymnoascus destructans, which affects hibernating bats. The fungus exists in caves and abandoned mines where bats spend the winter hibernating.

Wavyleaf Basketgrass

Wavyleaf Basketgrass

Oplismenus hirtellus subsp. undulatifolius

Wavyleaf basketgrass is a perennial grass with a distinctly hairy stem and leaf sheath. The deep green leaves are characteristically wavy and grow to about 1 inch wide and up to 4 inches long. The plant produces small, wispy flowers at the ends of its branches in the fall. Its seeds grow in 3-5 pairs of spikelets with long awns (pointed tips) that produce a sticky substance to aid in dispersal.

Waterwheel

Waterwheel

Aldrovanda vesiculosa

Waterwheel is an herbaceous carnivorous, aquatic plant that captures small, aquatic invertebrates using clamshell-type traps, similar to the venus flytrap. It floats just below the water's surface and has stems 2-8 inches long, with whorls of 5-9 leaves. Waterwheel rarely flowers, but when it does, the small, greenish-white flowers emerge from the water, while the fruit capsules are held underwater.

Water Lettuce

Water Lettuce

Pistia stratiotes

Water lettuce is an often free-floating aquatic plant. It forms thick mats that block sunlight and slow or prevent the growth of native aquatic plants.

Water Hyacinth

Water Hyacinth

Oshuna crassipes

Water hyacinth is a free-floating, perennial, aquatic plant. In climates where it is unable to survive the winter, water hyacinth will grow as an annual. Its leaves are round, curved, glossy bright green and float above the water’s surface on bulbous stalks.

Photo by Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Water Chestnut

Water Chestnut

Trapa natans

Water chestnut is a fast-growing, floating annual that can grow to 16 ft. The most distinctive trait of this plant is its thorny nutlets.