Longhood Milkweed

Asclepias macrotis, commonly known as Longhood Milkweed, is a perennial herbaceous plant native to the central and eastern regions of the United States, particularly found in areas such as prairies, open woodlands, and along roadsides. This species typically reaches a height of 60 to 90 centimeters (24 to 35 inches) and exhibits an upright growth habit with a somewhat sparse, open form. The stems are often unbranched and can be glabrous or slightly pubescent, contributing to the plant’s overall texture.

The leaves of Asclepias macrotis are lanceolate to linear, measuring 5 to 15 centimeters (2 to 6 inches) in length, and are arranged oppositely along the stem. They are characterized by a smooth margin and a deep green color, providing a stark contrast to the plant’s striking flowers. The inflorescence consists of clusters of small, tubular flowers that are typically pale to bright pink, with a distinctive long corolla tube, which gives rise to the common name “Longhood.” Flowering occurs from late spring to early summer, attracting a variety of pollinators, including bees and butterflies. The fruit is a slender, elongated follicle that can reach lengths of up to 10 centimeters (4 inches), containing numerous seeds that are equipped with silky hairs, facilitating wind dispersal.

Ecologically, Asclepias macrotis plays a significant role as a host plant for several species of butterflies, notably the monarch butterfly (Danaus plexippus), which relies on milkweed species for larval development. The plant’s latex sap contains toxic compounds known as cardenolides, which serve as a defense mechanism against herbivores. Additionally, Longhood Milkweed has been utilized in traditional medicine for its potential therapeutic properties, although caution is advised due to its toxicity. Its adaptation to various soil types and ability to thrive in disturbed habitats make it a resilient species within its native range.