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Asclepias stenophylla A. Gray
Slimleaf Milkweed, Narrowleaf Milkweed, Narrowleaf Green Milkweed
Asclepiadaceae (Milkweed Family)
Synonym(s): Acerates angustifolia, Polyotus angustifolius
USDA Symbol: ASST
USDA Native Status: L48 (N)
Herbaceous perennial with usually solitary, narrow, mostly glabrous to puberlulent stems 8" to 40" in height. Leaves alternate to approximate or opposite, linear, 2-7" in length; sessile. Inflorescences axillary from upper leaf nodes in many-flowered umbels. Flowers showy; color pale greenish-white to pale yellowish, sometimes purplish tinged. Follicles 9-12cm long.
Endangered in IL, IA, MN.
From the Image Gallery
Plant CharacteristicsDuration: Perennial
Root Type: Tuberous
Leaf Arrangement: Alternate , Opposite
Leaf Complexity: Simple
Leaf Shape: Linear
Leaf Pubescence: Glabrous , Puberulent
Leaf Margin: Entire
Leaf Apex: Acute
Breeding System: Flowers Bisexual
Inflorescence: Axillary , Umbel
Fruit Type: Follicle
Size Notes: To about 40 inches in height.
Fruit: Follicles 9-12cm in length.
Bloom InformationBloom Color: White , Yellow , Green
Bloom Time: Jun , Jul , Aug
Bloom Notes: Flowers in summer.
DistributionUSA: AR , CO , IA , IL , KS , LA , MN , MO , MT , NE , OK , SD , TX , WY
Native Distribution: United States Great Plains.
Native Habitat: Stable prairies and limestone glades.
Growing ConditionsWater Use: Low , Medium
Light Requirement: Sun
Soil Moisture: Dry
Soil pH: Alkaline (pH>7.2)
Drought Tolerance: Medium , High
Cold Tolerant: yes
Heat Tolerant: yes
Soil Description: Rocky or sandy limestone soils.
BenefitUse Wildlife: Monarch butterfly larval food. Nectar source for many insect and birds.
Use Food: Poisonous.
Warning: All parts poisonous.
Conspicuous Flowers: yes
Larval Host: Monarch butterfly.
Nectar Source: 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.
PropagationPropagation Material: Seeds
BibliographyBibref 293 - Manual of the Vascular Plants of Texas (1979) Correll, D. S. & M. C. Johnston
Search More Titles in Bibliography
Additional resourcesUSDA: Find Asclepias stenophylla in USDA Plants
FNA: Find Asclepias stenophylla in the Flora of North America (if available)
Google: Search Google for Asclepias stenophylla
MetadataRecord Modified: 2014-11-02
Research By: JAM