White flower of horsetail milkweed (Asclepias subverticillata)Asclepias subverticillata, south of the Pinos Altos Range and east-northeast of Silver City near Fort Bayard, west of Cameron Creek and north-northeast of Snake Hill, 32.816 -108.155, Grant County, New Mexico, 20 Aug 2017.
Horsetail Milkweed (Asclepias subverticllata) in a fieldAsclepias subverticillata, south of the Pinos Altos Range and east-northeast of Silver City near Fort Bayard, west of Cameron Creek and north-northeast of Snake Hill, 32.816 -108.155, Grant County, New Mexico, 20 Aug 2017.

Horsetail Milkweed (Asclepias subverticillata)

Host Plant: Monarch Butterfly

Nectar Plant: many other butterflies and bees

Flower Color: white

Growth Habit: herbaceous perennial to grows to 4 feet tall

Range in North America: western North America, except for west coast

Exposure: Full Sun to part shade

Hardiness: Zones 5-8

Soil Requirements: sandy, rocky soil in open area

Poison Milkweed, Western Milkweed, Bedstraw Milkweed

Horsetail Milkweed (Asclepias subverticillata), a member of the Apocynaceae (Dogbane Family), is a herbaceous perennial that grows to 4 feet tall and has white flowers that bloom in the summer.

Monarch Butterfly (Danaus plexippus)

Monarch Butterfly on Goldenrod – ALAN SCHMIERER from southeast AZ, USA, CC0, via Wikimedia Commons

Many butterflies and bees use this plant as a nectar source.

Horsetail milkweed is generally found in open sandy and rocky places, fields, pastures,

The species name of this plant refers to the not quite whorled arrangement of the leaves. The pods have been used as clothing by Native Americans.

Horsetail Milkweed (Asclepias subverticillata) Links

Webpages

Lady Bird Johnson Wildflower Center

Southwest Desert Flora

Videos

Gail Morris

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