| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Apocynaceae | Vincetoxicum nigrum | Black Swallow-wort | Disturbed areas. | Native of Mediterranean Europe. Reported for many states in ne. United States, south to MD, KY, TN. |  |
| Apocynaceae | Vincetoxicum rossicum | Pale Swallow-wort | Disturbed areas, especially suburban woodlands. In the ne. US, this species is becoming a problematic invader of high quality, rocky upland sites such as calcareous cliff and talus communities. | Native of s. Europe. |  |