SafePlants

Bearded Swallow-wort (Cynanchum barbigerum)

The Bearded Swallow-wort, scientifically known as Cynanchum barbigerum, is also referred to as Thicket Threadvine. It is a perennial vine found in specific regions of the United States.

Considerations for Pets

• This plant is a climbing vine.

Considerations for Children

• This plant is a climbing vine.

Taxonomy and Nomenclature

• Scientific Name: Cynanchum barbigerum (Scheele) Shinners
• Common Names: Bearded Swallow-wort, Bearded Swallowwort, Thicket Threadvine
• Family: Apocynaceae (formerly Asclepiadaceae, Milkweed Family)
• Synonym: Metastelma barbigerum Scheele
• Rank: Species
• Nomenclatural Reference: Field & Lab. 19: 65. 1951.

Distribution and Habitat

• Primarily found in Texas, specifically the South Texas Plains and Edwards Plateau.
• Also found in the southwestern United States, including New Mexico and Arizona.
• Grows climbing on boulders and over forbs and shrubs.

Morphological Characteristics

• Climbing vine that tightly twists.
• Reaches up to 6 feet long.
• Leaves are linear to broadly lanceolate.
• Flowers are about 1/8"-1/4" wide with a bulbous tube.
• Blooms are white in color.
• Blooms from March to July.

Ecological Role

• Swallow-wort vines can form tangled masses that shade and suppress native plants.

Interactions with Other Organisms

• Recommended for use with Preen Landscape Weed Control Fabric.

Further Information

• Discover Life: Provides information on the biology, natural history, ecology, identification, and distribution of Cynanchum barbigerum.
• Dave's Garden: A community for sharing tips and ideas about gardens, seeds, and plants.
• Garden Guides: Offers information on growing Bearded Swallow-wort, including planting care instructions.