BugwoodWiki Article

Black dog-strangling vine, black swallowwort
Vincetoxicum nigrum (L.) Moench


Black swallowwort is an herbaceous, twinning, perennial vine. Leaves are opposite, dark green, oval, shiny, entire, 3-4 in. (7.6-10.2 cm) long and 2-3 in. (5.1-7.6 cm) wide. Flowering occurs in June to July, when dark purple, 5-petaled, star-shaped flowers appear in clusters. Flowers are approximately 0.25 in. (0.6 cm) across and covered with white hairs. Fruit are pods, similar to milkweed pods, which are slender, 2-3 in. (5.1-7.6 cm) long and split to reveal small seeds with tufts of white hair. The hair allows the seeds to be readily dispersed. Plants have rhizomes that sprout new plants. Black swallowwort invades upland areas with a wide range of light and moisture conditions. Black swallowwort is native to Europe and escaped from a botanical garden in Massachusetts.


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EDDMapS Distribution - This map is incomplete and is based only on current site and county level reports made by experts, herbaria, and literature. For more information, visit www.eddmaps.org

EDDMapS Distribution

State Invasive List - This map identifies those states that list this species on their invasive species list. For more information, visit Invasive.org

State Invasives List

Taxonomic Rank

Kingdom: Plantae
Phylum: Magnoliophyta
Class: Magnoliopsida
Subclass: Asteridae
Order: Gentianales
Family: Asclepiadaceae
Genus: Vincetoxicum

Other System Links

Plants: CYLO11
Bayer: CYKNI
GRIN: 405616
ITIS: 506929

Synonyms and Other Names

Other Common Names:
Louis' swallow-wort

Related Scientific Names:

Cynanchum louiseae Kartesz & Gandhi(Synonym)
Cynanchum nigrum Kartesz & Gandhi(Synonym)


Category: Vines
Category: Forbs/Herbs