dog-strangling vine, European swallowwort USDA PLANTS Symbol: CYRO8
U.S. Nativity: Exotic
Habit: Vines Forbs/Herbs
Vincetoxicum rossicum (Kleopov) Barbarich

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Taxonomic Rank: Magnoliopsida: Gentianales: Asclepiadaceae
Synonym(s): pale shallow-wort
Native Range: Not Found (BAIL);

Appearance
Cynanchum rossicum is an herbaceous, twining, long-lived perennial vine. The vines can reach 5 ft. (1.5 m) in length.
Foliage
Leaves are opposite, dark green, oval, shiny, 3-4 in. (7.6-10.2 cm) long and 2-3 in. (5.1-7.6 cm) wide. They are attached to the vine by a petiole about 0.4 in. (1 cm).
Flowers
Flowering occurs in June to September, when dark pink to deep red, 5-petaled, star-shaped flowers appear in clusters. Flowers are approximately 0.25 in. (0.6 cm) across and are covered with white hairs.
Fruit
The fruits are similar to milkweed pods. They are slender, 2-3 in. (5.1-7.6 cm) long and split to reveal small seeds with tufts of white hairs. The hairs allow the seeds to be readily dispersed by the wind.
Ecological Threat
Cynanchum rossicum invades upland areas and tolerates a wide range of light and moisture conditions. It can grow rapidly over native vegetation to the point of dominating the understory of a woodland. Wind-dispersed seeds allow it to disperse over long distances. When it is cut, this plant resprouts vigorously, making control difficult. It is native to Europe and was likely introduced into the United States for ornamental purposes.

Identification, Biology, Control and Management Resources

Selected Images from Invasive.orgView All Images at Invasive.org


Plant(s);
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Feature(s); Comparision of flowers of Cynanchum louiseae (top) and Cynanchum rossicum (bottom)
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Flower(s);
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Flower(s);
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Infestation;
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Fruit(s);
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Infestation;
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Seed(s); Close-up of fruit with seeds
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Flower(s);
John M. Randall, The Nature Conservancy, Bugwood.org
Additional Resolutions & Image Usage

Flower(s);
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Fruit(s);
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Foliage;
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Foliage;
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

EDDMapS Distribution:
This map is incomplete and is based only on current site and county level reports made by experts and records obtained from USDA Plants Database. For more information, visit www.eddmaps.org
 


State(s) Where Reported invasive.
Based on state level agency and organization lists of invasive plants from WeedUS database.


Invasive Listing Sources:
Faith Campbell, 1998
Hoffman, R. & K. Kearns, Eds. 1997. Wisconsin manual of control recommendations for ecologically invasive plants. Wisconsin Dept. Natural Resources, Bureau of Endangered Resources. Madison, Wisconsin. 102pp.
Invasive Plant Council of New York State
John Randall, The Nature Conservancy, Survey of TNC Preserves, 1995.
Mid-Atlantic Exotic Pest Plant Council, 2005
New Hampshire Invasive Species Committee. 2005. Guide to Invasive Upland Plant Species in New Hampshire. New Hampshire Department of Agriculture,  Markets and Food Plant Industry Division and New Hampshire Invasive Species Committee.