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The White swallow-wort (Cynanchum vincetoxicum) belongs to Asclepiadaceae (the Milkweed family). It is a perennial herb that is distributed from Europe to western Siberia, northern Turkey and northwestern Africa. It grows on cliffs and slopes in temperate regions, especially on calcareous soils, and grows up to 1 m tall. The leaves are ovate to lanceolate, with short petioles, and grow in opposite pairs. The corolla has five petals. The fruit is about 5 cm long and contains many seeds with tufts of white hairs. The plant is poisonous and its leaves and rhizomes have been used to treat illness and for witchcraft.
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