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Asclepias stenophylla A. Gray
Slimleaf Milkweed, Narrowleaf Milkweed, Narrowleaf Green Milkweed
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.
Plant CharacteristicsDuration: Perennial Habit: Herb 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 Size Notes:
Plant 8-40 in height. Flower:
Follicles 9-12cm in length. Size Class:
Bloom InformationBloom Color: White , Yellow , Green
Bloom Time: Jun , Jul , Aug
Bloom Notes: Flowers in summer.
, 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.
Monarch butterfly larval food. Nectar
source for many insect and birds. Use Food:
All parts poisonous. Conspicuous Flowers:
Butterflies Larval Host:
Monarch butterfly. Nectar Source:
PropagationPropagation Material: Seeds
Record Last Modified: 2012-12-19
Research By: JAM