Also called Louise's swallow-wort and black dog-strangling vine.  Formerly called Cynanchum nigrum and Vincetoxicum nigrum.

Native to southern 🇪🇺 Europe.  Invasive > learn+quiz Invasive > in USA+Canada Invasive > report it! Invasive > in Michigan inv. trading card

For kids!  This plant described in invasive species placemat series

This plant is particularly harmful in areas with the 🦋 monarch butterfly Danaus plexippus , as this plant is similar enough to milkweed (Asclepias and related genera) to attract Monarch adults to lay their eggs on it, but different enough that their young (monarch caterpillars) cannot feed on it, thus eliminating these monarchs from the ecosystem. 

Learn more about black swallow-wort Cynanchum louiseae

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