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Home  /  Plants  /  Budburst Species  /  Asclepias fascicularis
Phenology Observation Sheet for Wildflowers and Herbs

COMMON NAME

Mexican whorled milkweed

SCIENTIFIC NAME

Asclepias fascicularis

ALSO KNOWN AS

Narrowleaf milkweed

Plant family

Dogbane (Apocynaceae)

Plant group

Wildflowers and Herbs

Mexican whorled milkweed is a 1-3 feet tall herbaceous perennial with many stems growing upright.
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OBSERVERS
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OBSERVATIONS
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Identification hints

Mexican whorled milkweed has a distinct appearance with its slender stems and very long and narrow leaves, lending this plant one of its common names.
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Did you know?

Mexican whorled milkweed is the most widespread species of milkweed in California. Dead stems of this plant are used by orioles for nests.
DISTRIBUTION IN TH U.S.
California , Idaho , Nevada , Oregon , Utah , Washington
HABITAT
This milkweed is found in dry to moist soil in open, sunny areas such as valley grasslands, wetland-riparian areas, and clearings within pine forests.
ATTRIBUTES
Leaves
Leaves of Mexican whorled milkweed are distinctly long and narrow (up to 6" long and 3/4" wide) and occur in whorls of 4 along the stem. The leaf margins typically fold upward, making the leaves appear boat-shaped, or like a "V" in cross-section.
Flowers
The flowers are arranged in 4-5" wide clusters that are held upright. The clusters are dense with at least 20 flowers that are individually less than 1/4" wide. The horns and hoods are greenish-white, while the petals are usually tinged with pink or purple and bent downwards.
Fruits
The fruit of Mexican whorled milkweed is a seedpod that opens along one side (follicle). It's smooth, long and slender, becoming brown when ripe. The flat oval-shaped seeds have a tuft of silky white hair attached.
Bloom Time
Blooms June to September.

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