Asclepias verticillata, also known as whorled milkweed, is one of the many species of milkweed found in North America. This species gets its name from its unique arrangement of leaves, which grow in a whorled pattern around the stem. Despite its relatively obscure name, whorled milkweed is an important plant for pollinators and plays a valuable role in local ecosystems. Other common synonyms for Asclepias verticillata include horsetail milkweed, eastern whorled milkweed, and whorled-leaf milkweed. Milkweeds in general are well known for their importance to monarch butterflies, whose caterpillars depend on the plants as a food source.