Asclepias subverticillata (A. Gray) Vail — Overview

Poison Milkweed learn more about names for this taxon

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Poison Milkweed (Asclepias subverticillata) - also known as Horsetail Milkweed, Bedstraw Milkweed and Whorled Milkweed - is a weedy, invasive perennial in the Asclepiadaceae family. It is a widespread lower elevation milkweed that sometimes forms large stands from 12 to 24 inches tall. The leaves are narrowly lance-shaped. The flowers are terminal and axillary and white or cream-colored, flowering and fruiting from June to August. The follicles are relatively small.

Found in Western North America (Kansas, Missouri, North Dakota, Oklahoma, South Dakota, Colorado, Idaho, Wyoming, New Mexico, Texas, Arizona, Nevada, Utah) and northern Mexico (Chihuahua, Coahuila, Durango, Nuevo Leon, San Luis Potosi, Zacatecas), it is poisonous to mammals while also being an important food source for Monarch Butterflies. It grows on dry, gravelly sites or along ditches and streams.


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Supplier: Bob Corrigan

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