Asclepias verticillata L.
Whorled Milkweed, Eastern Whorled Milkweed
Asclepiadaceae (Milkweed Family)
USDA Symbol: asve
Whorled milkweed is a single-stemmed, unbranched perennial, 1-3 ft. tall. The narrow, linear leaves are whorled along the stem. Small, greenish-white flowers occur in flat-topped clusters on the upper part of the stem.
Because of its toxicity to livestock, this plant is considered a weed in range areas.
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Plant CharacteristicsDuration: Perennial
Root Type: Tap
Leaf Complexity: Simple
Leaf Shape: Linear
Leaf Pubescence: Glabrous
Leaf Apex: Acute
Flower: Flowers 2 mm
Fruit: 10 cm
Size Class: 1-3 ft.
Bloom InformationBloom Color: White , Green
Bloom Time: May , Jun , Jul , Aug , Sep
DistributionUSA: AL , AR , AZ , CT , DC , DE , FL , GA , IA , IL , IN , KS , KY , LA , MA , MD , MI , MN , MO , MS , MT , NC , ND , NE , NJ , NM , NY , OH , OK , PA , RI , SC , SD , TN , TX , VA , VT , WI , WV , WY
Canada: MB , ON , SK
Native Distribution: MA to MT, s. to FL & e. TX; also s. Canada
Native Habitat: Woodland
Growing ConditionsWater Use: Low
Light Requirement: Sun , Part Shade
Soil Moisture: Dry
Soil Description: Sandy, clayey or rocky soils.
Conditions Comments: Whorled milkweed is one of the more poisonous or the milkweeds to livestock. It is therefore considered a weed in range areas.
BenefitWarning: POISONOUS PARTS: All parts. Toxic only in large quantities. Syptoms include, vomiting, stupor, weakness, spasms. Toxic Principle: Cardiac glycosides and resinoids. (Poisonous Plants of N.C. State)
Conspicuous Flowers: yes
Larval Host: Monarch
Value to Beneficial InsectsSpecial Value to Native Bees
Special Value to Bumble Bees
Special Value to Honey Bees
Supports Conservation Biological Control
This information was provided by the Pollinator Program at The Xerces Society for Invertebrate Conservation.
Butterflies and Moths of North America (BAMONA)
Learn more at BAMONA
PropagationDescription: Plant seeds outside in the fall. Seedlings will germinate immediately but may not flower until the second year.
Seed Collection: Not Available
Seed Treatment: Not Available
Commercially Avail: yes
National Wetland Indicator Status
From the National Organizations DirectoryAccording to the species list provided by Affiliate Organizations, this plant is on display at the following locations:
Delaware Nature Society - Hockessin, DE
Stengl Biological Research Station - Smithville, TX
Natural Biodiversity - Johnstown, PA
NPSOT - Austin Chapter - Austin, TX
Mt. Cuba Center - Hockessin, DE
BibliographyBibref 1186 - Field Guide to Moths of Eastern North America (2005) Covell, C.V., Jr.
Bibref 1185 - Field Guide to Western Butterflies (Peterson Field Guides) (1999) Opler, P.A. and A.B. Wright
Bibref 946 - Gardening with Prairie Plants: How to Create Beautiful Native Landscapes (2002) Wasowski, Sally
Bibref 841 - Native Alternatives to Invasive Plants (2006) Burrell, C. C.
Search More Titles in Bibliography
Research LiteratureReslit 456 - Spatial and temporal genetic structure of Asclepias verticillata (whorled milkweed) among prairie patches in a forested landscape (1996) S. A. Fore and S. I. Guttman
Reslit 546 - Ambulatory Use of Ventro-Lateral Abdominal Ampullae by Larvae of Labidomera Clivicollis (Kirby) (Coleoptera: Chrysomelidae: Chrysomelinae) (2009) G. T. Gustafson and C. S. Chaboo
Reslit 1551 - The Rare Asclepias texana and its Widespread Sister Species, A. perennis, are Self-Incompatible and Interfertile (1998) R. Wyatt, A. L. Edwards, S. R. Lipow and C. T. Ive...
Reslit 2192 - Genetic structure of Helianthus occidentalis (Asteraceae) in a preserve with fragmented habitat (1999) S. A. Fore and S. I. Guttman
Reslit 2386 - Nectar Production and Flower Visitors of Asclepias verticillata (1979) M. F. Willson, R. I. Bertin and P. W. Price
This information was provided by the Florida WIldflower Foundation.
Search More Titles in Research Literature
Additional resourcesUSDA: Find Asclepias verticillata in USDA Plants
FNA: Find Asclepias verticillata in the Flora of North America (if available)
Google: Search Google for Asclepias verticillata
MetadataRecord Modified: 2018-11-14
Research By: TWC Staff