Vincetoxicum rossicum (weed)

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Vincetoxicum rossicum (click on image to enlarge it)
Author(s): Leslie J. Mehrhoff, University of Connecticut
Source: IPM Images

Vincetoxicum rossicum (weed) (Kleopow) Barbar. - (pale swallow-wort)

The weed is native to eastern Europe and invasive in north-eastern North America. It suppresses native plants and can form dense stands in disturbed habitats, especially on calcareous soils. The vine-like plant grows to a length of 1.5 m and has oval, shiny leaves, up to 10 cm long, and tiny star-shaped flowers, about 5 mm in diameter.

The species is similar to Vincetoxicum nigrum, also invasive in North America, but the flowers are pink to maroon. It is also more shade tolerant compared to V. nigrum.

Vernacular names
• English: pale swallow-wort
European swallow-wort
dog-strangling vine
• Français: vigne étrangle chien

For details see the respective page in BugwoodWiki.

Synonyms:
Cynanchum rossicum