Invasives
Multiflora Rose (Rosa multiflora)
Multiflora rose is a thorny, perennial shrub with arching stems (canes), and leaves divided into five to eleven sharply toothed leaflets. The base of each leaf stalk bears a pair of fringed bracts. Beginning in May or June clusters of showy, fragrant, white to pink flowers appear, each about an…
Oriental Bittersweet (Celastrus orbiculatus)
Overview: Deciduous woody perennial plant which grows as a climbing vine and a trailing shrub. Size: Mature plants can attain stem widths of 4 inches in diameter and grow as high as 60 feet into trees. Leaves: Alternate, glossy, nearly as wide as they are long (round), with finely toothed…
Purple Loosestrife (Lythrum salicaria)
Purple loosestrife is an erect perennial herb in the loosestrife family, with a square, woody stem and opposite or whorled leaves. Leaves are lance-shaped, stalkless, and heart-shaped or rounded at the base. Plants are usually covered by a downy pubescence. Loosestrife plants grow from four to ten feet high, depending…
Spotted Knapweed (Centaurea stoebe)
Spotted knapweed, previously known as Centaurea biebersteinii, is a biennial or short-lived perennial. Its name is derived from the spots formed by black margins on the flower bract tips. Spotted knapweed typically forms a basal rosette of leaves in its first year and flowers in subsequent years. Rosette leaves are…
Tree-of-Heaven (Ailanthus altissima)
Tree-of-heaven, also known as ailanthus, Chinese sumac, and stinking shumac, is a deciduous tree in the mostly tropical quassia family. Mature trees can reach 80 feet in height. Tree-of-heaven has smooth stems with pale gray bark and twigs which are light chestnut brown, especially in the dormant season. Its large…
Water Chestnut (Trapa natans)
Overview: Annual rooted, aquatic plant with both floating and submersed leaves. Size: Stems can be 12-15 feet long Leaves: Floating leaves form a rosette and are green, glossy and triangular with toothed edges. The submersed leaves are feathery and whorled around the stem. Stem/Bark: Hollow, air-filled, and cord-like. Flowers: Tiny,…
Wild Chervil (Anthriscus sylvestris (L.) Hoffm.)
Wild chervil, also called cow parsley, is an herbaceous biennial that grows 3–4 feet tall. The hollow stems are branched and covered with soft hairs. The compound, alternate leaves are fernlike—each leaf is divided into leaflets that are also divided. Plants have long taproots that grow up to 6 feet…