Selected images for Black dog-strangling vine, black swallowwort (Cynanchum louiseae )
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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5392705 Black dog-strangling vine, black swallowwort Cynanchum louiseae Infestation John M. Randall |
5275020 Black dog-strangling vine, black swallowwort Cynanchum louiseae Seed(s) Leslie J. Mehrhoff |
5452087 Black dog-strangling vine, black swallowwort Cynanchum louiseae Flower(s) Leslie J. Mehrhoff |
5452176 Black dog-strangling vine, black swallowwort Cynanchum louiseae Flower(s) Leslie J. Mehrhoff |
5452234 Black dog-strangling vine, black swallowwort Cynanchum louiseae Flower(s) Leslie J. Mehrhoff |
5452081 Black dog-strangling vine, black swallowwort Cynanchum louiseae Fruit(s) Leslie J. Mehrhoff |
5452083 Black dog-strangling vine, black swallowwort Cynanchum louiseae Fruit(s) Leslie J. Mehrhoff |
5452161 Black dog-strangling vine, black swallowwort Cynanchum louiseae Foliage Leslie J. Mehrhoff |
5436619 Black dog-strangling vine, black swallowwort Cynanchum louiseae Seed(s) Bruce Ackley |
5436618 Black dog-strangling vine, black swallowwort Cynanchum louiseae Seed(s) Bruce Ackley |
5452217 Black dog-strangling vine, black swallowwort Cynanchum louiseae Plant(s) Leslie J. Mehrhoff |
5275015 Black dog-strangling vine, black swallowwort Cynanchum louiseae Infestation Leslie J. Mehrhoff |
