Asclepias asperula ssp. capricornu
Asclepias asperula (Decne.) Woodson ssp. capricornu (Woodson) Woodson
Antelope-horns, Antelope Horns, Antelope Horns Milkweed
Asclepiadaceae (Milkweed Family)
Synonym(s): Asclepias asperula var. decumbens, Asclepias capricornu, Asclepias capricornu ssp. occidentalis, Asclepias decumbens, Asclepiodora decumbens
USDA Symbol: ASASC
"Stems partly decumbent or low-spreading, 10-60 cm long, minutely pubescent or largely glabrous; petioles 2-7 mm long; corolla lobes pale yellowish green, sometimes purple-tinged; gynostegium greenish cream to dark purple; hoods widespreading, without horns." (Bibref 281)
"The common name Antelope-horns is said to come from the curved fruits.
Reportedly poisonous to livestock." (Bibref 281)
From the Image Gallery
Plant CharacteristicsDuration: Perennial
Root Type: Tap
Leaf Arrangement: Alternate , Opposite
Leaf Shape: Lanceolate , Linear
Leaf Margin: Entire
Leaf Apex: Acuminate
Breeding System: Flowers Bisexual
Fruit Type: Follicle
Size Notes: Stems up to about 2 feet long.
Leaf: Leaves irregularly grouped. Often opposite or near opposite on proximal portion of stem, alternate distally.
Bloom InformationBloom Color: Yellow , Green
Bloom Time: Mar , Apr , May , Jun , Jul , Aug , Sep , Oct
Bloom Notes: Hood-shaped, greenish-cream color. Flowers heavily in spring, sporadically summer through fall. May flower whenever conditions are right.
DistributionUSA: KS , NE , NM , OK , TX
Native Habitat: "Rocky or sandy prairies; Blackland Prairie w to Rolling Plains and Edwards Plateau." (Bibref 281)
Growing ConditionsWater Use: Medium
Light Requirement: Part Shade
Soil Moisture: Moist
BenefitUse Wildlife: Larval host for Monarch Butterflies and Queen Butterflies.
Warning: 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
Larval Host: Monarch Butterfly, Queen Butterfly
Nectar Source: yes
Deer Resistant: High
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.
From the National Organizations DirectoryAccording to the species list provided by Affiliate Organizations, this plant is on display at the following locations:
Lady Bird Johnson Wildflower Center - Austin, TX
Wildflower Center Seed BankLBJWC-40 Collected 2002-05-25 in Travis County by Lady Bird Johnson Wildflower Center
BibliographyBibref 281 - Shinners & Mahler's Illustrated Flora of North Central Texas (1999) Diggs, G. M.; B. L. Lipscomb; B. O'Kennon; W. F...
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Additional resourcesUSDA: Find Asclepias asperula ssp. capricornu in USDA Plants
FNA: Find Asclepias asperula ssp. capricornu in the Flora of North America (if available)
Google: Search Google for Asclepias asperula ssp. capricornu
MetadataRecord Modified: 2022-04-30
Research By: TWC Staff, NH