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Bransford, W.D. and Dolphia
Asclepias fascicularis Decne.
Mexican whorled milkweed, Narrowleaf milkweed
Synonym(s): Asclepias mexicana
USDA Symbol: asfa
USDA Native Status: L48 (N)
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.
Plant CharacteristicsDuration: Perennial Habit: Herb Root Type: Tap Leaf Complexity: Simple Leaf Shape:
Linear Leaf Venation: Pinnate Leaf Apex: Acute Breeding System:
Flowers Bisexual Flower:
Fruit: Size Class:
Bloom InformationBloom Color: Green
Bloom Time: Jun , Jul , Aug , Sep
, WA Native Distribution:
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.
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:
PropagationDescription: Sow seed.
Seed Collection: Not Available
Seed Treatment: No treatment.
Commercially Avail: yes
National Wetland Indicator Status
|Status:|| FAC || FAC |
This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1
(Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here
for map of regions.
From the National Organizations Directory
According to the species list provided by Affiliate Organizations, this plant is either on display or available from the following:
Native Seed Network
- Corvallis, OR
Record Last Modified: 2007-01-01
Research By: TWC Staff