Cynanchum louiseae (C. nigrum, Vincetoxicum nigrum)

Cynanchum louiseae (C. nigrum, Vincetoxicum nigrum): black swallowwort

Plant Identification:

• Growth form: perennial, twining herbaceous vine
• Leaves: oval shaped with pointed tips, 3-4 inches long and 2-3 inches wide occurring in pairs along the stem
• Flowers: small five-petaled start shaped, dark purple flowers with white hairs, borne in clusters
• Fruits: slender tapered pods, 2-3 inches long, .25 inches wide, turning from grey to light brown in color as they mature

For more information on black swallowwort plant identification, please visit:

• GoBotany
• Invasive.org
• USDA Weed of the Week
• National Park Service
• EDDMaps

For more information on black swallowwort best management practices, please visit:

• EDDMaps
• GoBotany
• Biological Control - Center for Invasive Species Prevention
• National Park Service
• Invasives.org