Cynanchum louiseae

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Legend for Species Pages

Black swallow-wort

(also known as Black dog-strangling vine, Louise's swallow-wort)

Cynanchum louiseae (L.) Kartesz & Gandhi


Cynanchum nigrum (L.) Pers., non Cav.

Vincetoxicum nigrum (L.) Moench

  • Moss, Flora of Alberta – No
  • [1]Global Invasive Species Database –
  • [2]NatureServe I-Rank – High
  • "...Large, monospecific stands can form in open, fully-exposed areas. In brushy areas, these vines can over-top and smother shrubs, forming the dominant cover..."

  • AB Weed Act status – ?


[3] Link to Wikipedia, Cynanchum_louiseae - "...native to Europe and is found primarily in Italy, France, Portugal, and Spain.[4] It is an invasive plant species in the northeastern United States, parts of the Midwest, southeastern Canada, and California..."

[4] Link to USDA Plants, Profile and map for Cynanchum louiseae Kartesz & Gandhi, Louise's swallow-wort

Comparision of flowers of Cynanchum louiseae (top) and Cynanchum rossicum (licensed under a Creative Commons Attribution 3.0 License.)