Common Names: Black swallow-wort, Louise's swallow-wort, black dog-strangling vine
Sub-category: Milkweed family
It is native to Europe, but an invasive species in the northeastern United States. A perennial, herbaceous vine with oval shaped leaves that have pointed tips. The leaves are 3 to 4 inches long and 2 to 3 inches wide and often occur in pairs on the stem. The flowers have five petals that are star-shaped with white hairs. The flowers range in color from dark purple to black. The fruit is slender, tapered pods that range in color from green to light brown.
Often found in abandoned fields, hedgerows, brushy areas, woodlands, river banks, transportation corridors, quarries, agricultural fields, and gardens.
Primary Flower Color: Blue/Purple
Secondary Flower Color: Blue/Purple