Invasives

Brazilian Waterweed (Egeria densa)
Brazilian waterweed, also known as Brazilian elodea, is a submerged aquatic perennial plant that infests streams, lakes, and ponds. The bright green stems are generally 1-2 feet in length, but can be as much as 20 feet. The plant’s leaves are arranged in whorls of 4 to 6 leaves; the…

Eurasian Watermilfoil (Myriophyllum spicatum)
Eurasian watermilfoil, also called spike watermilfoil, is an emergent, herbaceous aquatic plant. Stems grow to the water surface, usually extending 3 to 10, but as much as 33, feet in length and frequently forming dense mats. Stems of Eurasian milfoil are long, slender, branching, hairless, and become leafless toward the…

Hydrilla (Hydrilla verticillata)
Hydrilla, also known as water thyme, is a submerged, aquatic, perennial herbaceous plant that can grow from depths of 20-25 feet. The stems have whorls of 3-8 tiny, strap-like leaves that are 0.2 to 0.8 inches long and 0.07-0.15 inches wide. The leaves have saw-toothed margins visible with a hand lens. Hydrilla…

Water Chestnut (Trapa natans)
Water Chestnut is a rooted, aquatic plant with both floating and submersed leaves. The floating leaves form a rosette and are green, glossy and triangular with toothed edges. The submersed leaves are feathery, and are found whorled around the stem. Plant stems are cord-like and can attain lengths of up…