exotic swallowwort USDA PLANTS Symbol: CYNAN
U.S. Nativity:
Habit: Vines
Vincetoxicum spp. L.

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Taxonomic Rank: Magnoliopsida: Gentianales: Asclepiadaceae
Synonym(s): swallowwort

Several species of swallow-worts are herbaceous, perennial vines that invade natural areas in northeastern United States. Leaves are opposite, dark green, oval, and shiny with entire margins. Flowers occur in clusters and dark purple in color. Fruit are pods, similar to milkweed pods, that are slender and split to reveal small seeds with tufts of white hair. The hair allows the seeds to be readily dispersed by seeds. Swallow-worts invade a wide varierty of habitats including old fields, open woodlands, pastures, roadsides, and floodplains. It can rapidly overgrow native understory vegetation and small shrubs, forming dense mats which smother and kill other vegetation. Swallow-worts are native to Europe and were first introduced in the United States in the late 1800s as ornamentals.

Identification, Biology, Control and Management Resources

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


Plant(s); vine on pasture fence
Heather Faubert, University of Rhode Island, Bugwood.org
Additional Resolutions & Image Usage

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

Flower(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); flower
Richard A. Casagrande, University of Rhode Island, Bugwood.org
Additional Resolutions & Image Usage

Richard A. Casagrande, University of Rhode Island, Bugwood.org
Additional Resolutions & Image Usage

Seed(s);
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: