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Asclepias viridis (Green antelopehorn)
Marcus, Joseph A.

Asclepias viridis

Asclepias viridis Walter

Green antelopehorn, Green milkweed

Asclepiadaceae (Milkweed Family)

Synonym(s): Asclepiodora viridis

USDA Symbol: ASVI2

USDA Native Status: L48 (N)

Green antelopehorn is a native, perennial forb or herb with alternate, entire leaves. The leaf margins are often wavy. Flowers are white and in an umbel, mostly one per plant. Upon close inspection, some rose or purple color is evident in the center of each individual flower (gynostegium). The milky substance that is exuded when a plant part is broken is very sticky, much resembling “Elmer’s glue.” These milkweeds bloom from late spring to middle summer.

Globally, there are 2,000 – 3,000 species in the milkweed (Asclepiadaceae) family. In Texas, there are five different genera in this family, with 35 species in the Asclepias genus. Asclepias viridis is the most common milkweed in Texas ranging from deep east Texas to the Edwards Plateau and typically has wider leaves than Asclepias asperula.


Plant Characteristics

Duration: Perennial
Habit: Herb
Root Type: Tap
Leaf Retention: Deciduous
Leaf Complexity: Simple
Leaf Shape: Lanceolate
Leaf Venation: Pinnate
Leaf Pubescence: Puberulent
Leaf Margin: Entire
Leaf Apex: Emarginate
Leaf Base: Truncate
Breeding System: Flowers Bisexual
Size Notes: 1 - 3
Leaf: Green
Flower: Flowers 8 mm
Size Class: 1-3 ft.

Bloom Information

Bloom Color: Green
Bloom Time: Apr , May , Jun , Jul , Aug , Sep
Bloom Notes: Flowers details are beautiful in how they are arranged in the cluster


USA: AL , AR , FL , GA , IL , IN , KS , KY , LA , MO , MS , NE , OH , OK , SC , TN , TX , WV
Native Habitat: This plant can be found on roadsides or in prairies all over the state of Texas. The plant can live in dry, limestone soil without much water and can still produce showy, globe-like flowers. Listed as endangered in Indiana (USDA)

Growing Conditions

Water Use: Low
Light Requirement: Sun
Soil Moisture: Moist
Cold Tolerant: yes
Heat Tolerant: yes
Conditions Comments: This is another member of the milkweed family that certain butterflies love. It can be found growing in rich or poor soils and blooms off and on over ther growing season through the end of summer. Has a spreading, open growth form. Requires little water and full sun.


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 person’s 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 plant’s 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
Fragrant Flowers: yes
Attracts: Butterflies
Nectar Source: yes
Deer Resistant: High

Value to Beneficial Insects

Special 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.


Propagation Material: Seeds
Commercially Avail: yes

Find Seed or Plants

Order seed of this species from Native American Seed and help support the Wildflower Center.

From the National Suppliers Directory

According to the inventory provided by Associate Suppliers, this plant is available at the following locations:

Wrights Nursery - Briggs, TX

From the National Organizations Directory

According to the species list provided by Affiliate Organizations, this plant is on display at the following locations:

Lady Bird Johnson Wildflower Center - Austin, TX
Texas Discovery Gardens - Dallas, TX
Stengl Biological Research Station - Smithville, TX
NPSOT - Austin Chapter - Austin, TX
NPSOT - Williamson County Chapter - Georgetown, TX


Bibref 328 - Wildflowers of Texas (2003) Ajilvsgi, Geyata.
Bibref 286 - Wildflowers of the Texas Hill Country (1989) Enquist, M.

Search More Titles in Bibliography

Additional resources

USDA: Find Asclepias viridis in USDA Plants
FNA: Find Asclepias viridis in the Flora of North America (if available)
Google: Search Google for Asclepias viridis


Record Modified: 2012-06-09
Research By: NPC, RLU, DEW

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