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UMass Extension Weed Herbarium
 

Common Name: black swallowwort, climbing milkweed, dog-strangle vine
Scientific Name: Cynanchum nigrum (L.) Pers., syn. Cynanchum louiseae, Vincetoxicum nigrum
Family Name: Asclepiadaceae - Milkweed Family

Identification Notes:

life cycle - introduced perennial, reproducing by seed

stems - unbranched, viney in nature, climbing or sprawling growth habit

leaves - opposite, ovate to broadly lanceolate, entire, somewhat shiny, very short petioles leaves 1, leaves 2

flowers - 5-petaled, dark purple to almost black, petals triangular with short white hairs; axillary clusters flowers 1, flowers 2

seedpods - green, long, slender, pointed, light brown when mature; seed flat with tuft of fine hairs seedpods 1, seedpods 2

Images:

Cynanchum nigrum thumbnail 1 Cynanchum nigrum thumbnail 2 Cynanchum nigrum thumbnail 3
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Cynanchum nigrum thumbnail 4 Cynanchum nigrum thumbnail 5 Cynanchum nigrum thumbnail 6 Cynanchum nigrum thumbnail 7
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