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Asclepias subverticillata (A. Gray) Vail
Horsetail milkweed, Poison Milkweed
Synonym(s): Asclepias galioides
USDA Symbol: ASSU2
USDA Native Status: L48 (N)
A plant forming feathery clumps or patches and bearing white, star-like flowers in round umbels and 3-5 very narrow leaves in whorls at nodes; sap milky.
Plant CharacteristicsDuration: Perennial Habit: Herb Flower:
Bloom InformationBloom Time: May , Jun , Jul , Aug , Sep
, WY Native Distribution:
Idaho, Nevada, and Arizona east to Missouri and south to Texas and Mexico. Native Habitat:
Sandy or rocky plains and desert flats and slopes; common along roadsides.
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.
From the National Organizations Directory
According to the species list provided by Affiliate Organizations, this plant is either on display or available from the following:
Sibley Nature Center
- Midland, TX
Record Last Modified: 2007-01-01
Research By: TWC Staff