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Spider Antelope-horns Asclepias asperula


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Spider Antelope-horns
© Lady Bird Johnson Wildflower Center

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Alternate name: Antelope-horns

Family: Asclepiadaceae, Milkweed view all from this family

Description Spider Antelope-horns is a clump-forming, 1-2 ft. perennial with an upright or sprawling habit. Its pale, greenish-yellow flowers, tinged maroon, are crowded in round, terminal clusters. The long, thick, narrow leaves are often folded lengthwise. As the green seed pods grow in length and begin to curve, they resemble antelope horns.

Warning This plant is reported to be toxic to animals, and like other plants in the genus Asclepias is probably also poisonous to humans. 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.

Flower April - August.

Flower April - August.

Habitat Dry plains and pastures; limestone hills; open pine woods.

Range C. Kansas to Texas and Mexico, west to s. Idaho and se. California.

Discussion Milkweeds are the primary food source for Monarch caterpillars.

Exposure Preference Sun.

Native Distribution C. Kansas to Texas & Mexico, w. to s. Idaho & s.e. California.

Site Preference Dry plains & pastures; limestone hills; open pine woods.

Soil Preference Dry, sandy or rocky soils.

Wildlife Value Milkweeds are the primary food source for monarch caterpillars. Antelope-horns is toxic to wildlife.