Asclepias fascicularis Decne.
Mexican whorled milkweed, Narrowleaf milkweed
Asclepiadaceae (Milkweed Family)
Synonym(s): Asclepias mexicana
USDA Symbol: ASFA
A 1-2 1/2 ft. perennial with several erect stems and narrow, whorled leaves. Several 4-5 in. wide flower clusters occur from the upper leaf axils. Individual flowers are greenish-white, often tinged with purple. The subsequent milkweed pod is smooth and slender.
From the Image Gallery
Plant CharacteristicsDuration: Perennial
Root Type: Tap
Leaf Complexity: Simple
Leaf Shape: Linear
Leaf Venation: Pinnate
Leaf Apex: Acute
Breeding System: Flowers Bisexual
Size Class: 1-3 ft.
Bloom InformationBloom Color: Green
Bloom Time: Jun , Jul , Aug , Sep
DistributionUSA: CA , ID , NV , OR , UT , WA
Native Distribution: N.e. WA & ID, s. to Baja CA & n. AZ
Native Habitat: Occurs in a variety of dry to moist places below 7000 ft.; uncommon on the desert
Growing ConditionsWater Use: Low
Light Requirement: Sun
Soil Moisture: Dry
Soil Description: Various dry to moist soils.
Conditions Comments: Easy to grow and quite drought tolerant.
BenefitWarning: All plants in the genus Asclepias are probably somewhat toxic, some fatally so, to both humans and animals. The sap of some causes skin irritation in humans. Sensitivity to a toxin varies with a personís age, weight, physical condition, and individual susceptibility. Children are most vulnerable because of their curiosity and small size. Toxicity can vary in a plant according to season, the plantís different parts, and its stage of growth; and plants can absorb toxic substances, such as herbicides, pesticides, and pollutants from the water, air, and soil.
Conspicuous Flowers: yes
Value to Beneficial InsectsSpecial Value to Native Bees
Special Value to Bumble Bees
Special Value to Honey Bees
Supports Conservation Biological Control
This information was provided by the Pollinator Program at The Xerces Society for Invertebrate Conservation.
PropagationDescription: Sow seed.
Seed Collection: Not Available
Seed Treatment: No treatment.
Commercially Avail: yes
Find Seed or Plants
Find seed sources for this species at the Native Seed Network.
National Wetland Indicator Status
From the National Organizations DirectoryAccording to the species list provided by Affiliate Organizations, this plant is on display at the following locations:
Native Seed Network - Corvallis, OR
Additional resourcesUSDA: Find Asclepias fascicularis in USDA Plants
FNA: Find Asclepias fascicularis in the Flora of North America (if available)
Google: Search Google for Asclepias fascicularis
MetadataRecord Modified: 2007-01-01
Research By: TWC Staff