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

Part of genus Cynanchum in dogbane  family Apocynaceae.

Native to southern 🇪🇺 Europe.   Invasive > learn+quiz Invasive > in USA+Canada Invasive > report it! Invasive > in Michigan (.pdf page 50)   inv. trading card (.pdf)

🚼︎ For kids!  This plant described in invasive species placemat (.pdf) series.

This plant is particularly harmful in areas with the monarch butterfly  Danaus plexippus, as this plant is similar enough to milkweed  genus 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

Best Control Practices BCP (Michigan) (.pdf) Fact sheet (Ontario) (.pdf) Fact sheet (Ontario) 🇫🇷 en français (.pdf) Biological Control in Eastern USA (.pdf page 217)

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