Pale Swallowwort
(Cynanchum rossicum)

Other common names: Dog Strangling Vine, Russian Swallowwort
Other scientific names: Cynanchum medium, Vincetoxicum medium, Vincetoxicum rossicum
Family: Milkweed Family (Asclepiadaceae)
Distinctive features: Opposite leaves on a vine, milkweed-like seed pods and seeds
Similar species:
  •   Black Swallowwort (Cynanchum nigrum)
  •   White Swallowwort (Cynanchum vincetoxicum)
Flowers: Summer;  Green/Brown;  5 parts (petals);  5-petals, purple/brown, petals smooth, 1/4" wide, late spring & summer.
Leaves: Opposite pairs, sometimes in a whorl, egg-shaped
Height: Vine, 2-6 feet long
Stem: Vine
Fruit/Seeds: In a pod closely resembling those of milkweed. but smaller
Habitat: Open areas, forest edges
Native/Non-native: Non-Native
Status: Common
Notes: Swallowworts are highly invasive alien plants, that will aggressively take over an area once they get a chance. Pull them up before they get a foothold.
See Also:
  •   Swallow-wort: Monarch Menace, from The Monday Garden, by Sue Sweeney
  

This is a dangerously invasive plant. It grows fast, spreads rapidly, and climbs all over other vegetation, overcoming it.

This plant is a vine, and it climbs by twisting around other plants, including itself.

The purple/brown flowers. Five petals, only about 1/4" across.

The shiny egg-shaped leaves and seed pods forming.

Leaves, in pairs along the stem.

Seed pods opening up to disperse the seeds, which are attached to fluffy parasols which allow them to be carried great distances.

Colony of Pale Swallowwort in the winter.
  

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