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Arizona Milkweed
Asclepias angustifolia

Photo Citations
Naturedigger would like to thank the following individuals for their contributions to the Arizona milkweed (Asclepias angustifolia) identification slide:
Flower image provided by: Max Licher, SEINet (cropped)
Leaf/stem images provided by: Sam Kieschnick, iNaturalist Observation
(cropped) CC BY-NC 40
Pod image provided by: Bodo, iNaturalist observation
(cropped) CC BY-NC 4.0
Asclepias angustifolia Profile
Common Name(s):
Arizona milkweed
narrow-leaved milkweed
narrow-leaf milkweed
slender milkweed
Scientific Name:
Asclepias angustifolia
Native Range:
AZ
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USDA Symbol:
ASAN5
Habitat:
• dry, rocky soil
• canyons
• along stream beds
• hilly slopes
• elevation 4,000-5,000 feet (1220-1500 meters)
Growing Conditions:
• full sun to partial shade
Plant Height:
24-36 inches (61-92 centimeters)
Stem Description:
• narrow and erect
• numerous stems arise from root crown on mature plants
Leaf Description:
• linear, lanceolate or elliptic
• 1.5-4.75 inches (4-12 centimeters) long
• 0.5-1.0 inches (2-11 centimeters) wide
• petioles short, up to 0.5 inch (2 centimeters) long
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Leaf Arrangement:
• opposite
Leaf Margin:
• entire
Leaf Surface:
• glabrous
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Flowering Period:
• March through August
Flower Description:
• small, approximately 0.12 inches (3 millimeters) long and same width
• white to whitish-pink with a purple or pink tinge
• horns protrude through the hoods of the flower
• corolla reflexes backward
• small, flat, erect umbel
• approximately 2 umbels per stem and approximately 10 flowers per umbel
Pod Description:
• erect, long and linear
• 2-3.5 inches (5-9 centimeters) long
• 0.75-1 (2-2.5 centimeters) wide
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Similar Species:
• horsetail milkweed (Asclepias subverticillata)
• whorled milkweed (Asclepias verticillata)
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Other Information:
• Only found in Arizona
To Locate and Purchase Seeds (when available):
Xerces Society Milkweed Seed Finder
Milkweed and Wildflower Vendors
For More Information About This Species Visit:
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Xerces Regional Milkweed Guide
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