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Cynanchum laeve is a vining perennial herb native to eastern and central U.S. states and Ontario. Common names include sand vine, honeyvine, honeyvine milkweed, bluevine milkweed, climbing milkweed, and smooth swallow-wort.

Cynanchum laeve
Cynanchum laeve NRCS-1.jpg
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Asterids
Order: Gentianales
Family: Apocynaceae
Subfamily: Asclepiadoideae
Genus: Cynanchum
Species: C. laeve
Binomial name
Cynanchum laeve

Ampelamus albidus
Ampelamus laevis
Gonolobus laevis

Cynanchum laeve'[1]

Like bindweed and some other members of the Convolvulaceae, Cynanchum laeve is a twining vine with heart-shaped leaves common in roadsides, fence rows, fields, and disturbed areas. However, C. laeve is easily recognized as a member of the Asclepiadoideae by its opposite leaf placement, milky sap and distinctive flowers and follicles ("milkweed pods"). The seeds are wind dispersed and can travel long distances.[2]

Cynanchum laeve is considered a noxious weed in several states,[3] and can be very difficult to eradicate from fields because of its deep, extensive root system.[4] Like many other milkweed species, C. laeve contains toxic cardenolide alkaloids,[5] and is a food plant for the caterpillars of monarch butterflies.[6]

Synonymous plant names include Ampelamus albidus (Nutt.) Britton, Ampelamus laevis (Michx.) Krings, and Gonolobus laevis Michx.[7]


  1. ^ 1913 illustration from Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. 3 vols. Charles Scribner's Sons, New York. Vol. 3: 36
  2. ^ Kansas Wildflowers and Grasses: Honeyvine Milkweed
  3. ^ USDA, NRCS. 2011. The PLANTS Database (, 19 June 2011). National Plant Data Team, Greensboro, NC 27401-4901 USA.
  4. ^ Kansas Wildflowers and Grasses: Honeyvine Milkweed
  5. ^ Burrows, G. E.; Tyrl, R. J., 2001. "Toxic plants of North America." Iowa State Univ Press, Ames. As referenced in the FDA Poisonous Plant Database
  6. ^ Kansas Native Plants: Butterfly Gardening
  7. ^ "Cynanchum laeve (Michx.) Pers., Honeyvine, Synonyms". Plants Database. US Department of Agriculture, Natural Resource Conservation Service. Retrieved 1 July 2015.