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Asclepias verticillata L.
Whorled milkweed, Eastern whorled milkweed
USDA Symbol: asve
USDA Native Status: L48 (N), CAN (N)
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.
Plant CharacteristicsDuration: Perennial Habit: Herb Root Type: Tap Leaf Complexity: Simple Leaf Shape:
Linear Leaf Pubescence: Glabrous Leaf Apex: Acute Flower:
Flowers 2 mm
10 cm Size Class:
Bloom InformationBloom Color: White , Green
Bloom Time: May , Jun , Jul , Aug , Sep
, WY Canada: MB
, SK Native Distribution: MA
s. to FL
& e. TX; also s. Canada Native Habitat:
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
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:
Butterflies and Moths of North America (BAMONA)
is a larval host and/or nectar source for:
National Wetland Indicator Status
This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1
(Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here
for map of regions.
Record Last Modified: 2013-10-24
Research By: TWC Staff