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Cynanchum laeve (Michx. ) Pers.
Life   Plantae   Dicotyledoneae   Asclepiadaceae   Cynanchum

Cynanchum laeve
© Les Mehrhoff, 2008-2010 · 5
Cynanchum laeve

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Cynanchum laeve
© Les Mehrhoff, 2008-2010 · 3
Cynanchum laeve
Cynanchum laeve
© Les Mehrhoff, 2008-2010 · 3
Cynanchum laeve

Cynanchum laeve
© Copyright Bobby Hattaway 2011 · 3
Cynanchum laeve

Associates · map
FamilyScientific name @ source (records)
Chrysididae  Pseudomalus purpuratus @ UCRC_ENT (1)
Coccinellidae  Coleomegilla maculata @ I_LB (1)

Harmonia axyridis @ I_LB (10)

Hippodamia convergens @ I_LB (1)
Colletidae  Hylaeus leptocephala @ UCRC_ENT (3)
Crabronidae  Ectemnius excavatus @ UCRC_ENT64786A (1)
Halictidae  Halictus ligatus @ UCRC_ENT (1)

Lasioglossum imitatum @ UCRC_ENT (1)

Lasioglossum zephyrus @ UCRC_ENT (2)
Tiphiidae  Myzinum @ UCRC_ENT (2)

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Following modified from MissouriPlants.com
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Cynanchum laeve (Michx.) Pers.

Cynanchum laeve plant

Family - Asclepiadaceae

Stems - Twining, climbing, herbaceous, often reddish, with milky sap, with villous pubescence in lines on the stems.

Cynanchum laeve stem Stem at a node.

Leaves - Opposite, petiolate. Petioles to +7cm long, reddish-green. Blades typically glabrous but also variously pubescent, dark green with evident veining above, cordate, ovate, acute to acuminate or apiculate, to +/-10cm long, +/-8cm broad.

Cynanchum laeve leaf

Inflorescence - Axillary umbellate cyme with +/-30 flowers. Peduncles to 5cm long, pubescent. Pedicels to 1cm long, pubescent.

Cynanchum laeve inflorescence Inflorescence.

Flowers - Corolla deeply 5-lobed. Lobes whitish, 7mm long, -3mm broad, erect to spreading, glabrous. Corona of 5 appendages. Appendages white, erect, to 6mm long, expanded at base, tapering into 2 linear lobes at apex. Calyx 5-lobed. Lobes green with some purple, ovate-lanceolate, to 3mm long, sparse pubescent.

Cynanchum laeve flower Flower close-up.

Cynanchum laeve flower Again.

Fruit - A large follicle, 10-11cm long, 4cm wide at widest point, teardrop-shaped, glabrous. Seeds winged, to +8mm long. Coma to 4cm long, white.

Cynanchum laeve fruit Follicle.

Flowering - July - September.

Habitat - Disturbed sites, along fences, waste ground, roadsides, railroads, thickets, open woods.

Origin - Native to U.S.

Other info. - Being from the Asclepiadaceae , this plant will "bleed" a white, latex-like secretion when pinched or bruised. Don't get this in your eyes nose or mouth as it can be irritating or harmful.
This plant is seen as a weed by some but it always dies back in the fall leaving the large fruits hanging until they split open dorsally. The seeds can be carried a great distance by the wind.
This species can be found throughout most of Missouri but is apparently absent from the south-central Ozark region.

Photographs in St. Louis, MO., 7-28-03.

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Following modified from Plants Database, United States Department of Agriculture
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http://plants.usda.gov/java/profile?symbol=CYLA ---> https://plants.usda.gov/java/profile?symbol=CYLA
https://plants.usda.gov/java/profile?symbol=CYLA ---> http://plants.usda.gov/core/profile?symbol=CYLA
http://plants.usda.gov/core/profile?symbol=CYLA ---> https://plants.usda.gov/core/profile?symbol=CYLA
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Cynanchum laeve (Michx.) Pers.

Image of Cynanchum laeve

General Information
Symbol: CYLA
Group: Dicot
Family: Asclepiadaceae
Duration: Perennial
Growth Habit : Forb/herb
Native Status : CAN   I
L48   N
Data Source and Documentation
About our new maps
Plants-NRCS Logos
green round image for nativity Native blue round image for introduced Introduced ocre round image for introduced and nativity Both white round image for no status Absent/Unreported
image for native, but no county data Native, No County Data image for introduced, but no county data Introduced, No County Data both introduced and native, but no county data Both, No County Data
Native Status:
lower 48 status L48    Alaska status AK    Hawaii status HI    Puerto Rico status PR    Virgin Islands status VI    Navassa Island NAV    Canada status CAN    Greenland status GL    Saint Pierre and Michelon status SPM    North America NA   


click on a thumbnail to view an image, or see all the Cynanchum thumbnails at the Plants Gallery

Robert H. Mohlenbrock. USDA NRCS. 1995. Northeast wetland flora: Field office guide to plant species . Northeast National Technical Center, Chester. Provided by USDA NRCS Wetland Science Institute (WSI). Usage Requirements .

Steve Hurst. Provided by ARS Systematic Botany and Mycology Laboratory . United States, KS, Baldwin City. Usage Requirements .

©Elaine Haug. Provided by Smithsonian Institution, Department of Botany . United States, VA, Woodbridge, Occoquan National Wildlife Refuge. Usage Requirements .

USDA NRCS. Wetland flora: Field office illustrated guide to plant species. USDA Natural Resources Conservation Service. Provided by NRCS National Wetland Team . Usage Requirements .

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. Provided by Kentucky Native Plant Society . Scanned by Omnitek Inc . Usage Requirements .



Symbol Scientific Name
AMAL3 Ampelamus albidus (Nutt.) Britton
AMLA11 Ampelamus laevis (Michx.) Krings
GOLA5 Gonolobus laevis Michx.


Click on a scientific name below to expand it in the PLANTS Classification Report.
Rank Scientific Name and Common Name
Kingdom Plantae – Plants
Subkingdom Tracheobionta – Vascular plants
Superdivision Spermatophyta – Seed plants
Division Magnoliophyta – Flowering plants
Class Magnoliopsida – Dicotyledons
Subclass Asteridae
Order Gentianales
Family Asclepiadaceae – Milkweed family
Genus Cynanchum L. – swallow-wort
Species Cynanchum laeve (Michx.) Pers. – honeyvine

Subordinate Taxa

This plant has no children

Legal Status

Threatened and Endangered Information:
This plant is listed by the U.S. federal government or a state. Common names are from state and federal lists. Click on a place name to get a complete protected plant list for that location.
Pennsylvania smooth swallow-wort Endangered
U.S. Weed Information
Cynanchum laeve climbing milkweed honeyvine honeyvine milkweed sandvine Ampelamus albidus honeyvine milkweed
This plant and synonym italicized and indented above can be weedy or invasive according to the authoritative sources noted below.This plant may be known by one or more common names in different places, and some are listed above. Click on an acronym to view each weed list, or click here for a composite list of Weeds of the U.S.
KY Haragan, P.D.. 1991. Weeds of Kentucky and adjacent states: a field guide . The University Press of Kentucky. Lexington, Kentucky.
NE&GP Stubbendieck, J., G.Y. Friisoe,and M.R. Bolick. 1994. Weeds of Nebraska and the Great Plains . Nebraska Department of Agriculture, Bureau of Plant Industry. Lincoln, Nebraska.
SWSS Southern Weed Science Society. 1998. Weeds of the United States and Canada. CD-ROM . Southern Weed Science Society. Champaign, Illinois.

Wetland Status

Interpreting Wetland Status

North America
Arid West FAC
Atlantic and Gulf Coastal Plain FAC
Eastern Mountains and Piedmont FAC
Great Plains FAC
Midwest FAC
Northcentral & Northeast FAC

Related Links

More Accounts and Images
ARS Germplasm Resources Information Network (CYLA)
Integrated Taxonomic Information System (AMAL3)
Integrated Taxonomic Information System (CYLA)
Integrated Taxonomic Information System (GOLA5)
USF Atlas of Florida Vascular Plants (CYLA)
University of Tennessee Herbarium (Distribution) (CYLA)
Related Websites
Purdue University, Botany Department: no-till abstract & images (CYLA)
Virginia: abstract & image (CYLA)



Source Large Mammals Small Mammals Water Birds Terrestrial Birds


Source Large Mammals Small Mammals Water Birds Terrestrial Birds

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