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Invasive Species: Vines
Cynanchum louiseae (Vincetoxicum nigrum)
Black swallow-wort, also known as dog-strangling vine, is a perennial vine with shiny, oval to heart-shaped leaves with pointed tips. Flowers are small, dark purple, and shaped like stars. Seed pods and seeds are similar to those of milkweed plants.
Chinese yam has slender vines that spiral counterclockwise and pointed, heart-shaped leaves that are often indented on the sides. The bulbils or air tubers are present from June to September and resemble very small potatoes. It has small, white or greenish-yellow flowers that smell like cinnamon.
Mile-a-minute weed has light green leaves shaped like an equilateral triangle and small white flowers. They produce a deep blue colored fruit arranged in clusters. Typical infestation areas include stream banks, open space, roadsides, forest edges, and fence lines.
Cynanchum rossicum (Vincetoxicum rossicum)
Pale swallow-wort is a perennial vine with shiny, green to yellow leaves and small, star-shaped flowers that are pale pink to reddish-brown. Seed pods and seeds resemble those of milkweed plants.