Asclepias asperula, commonly called green-flowered milkweed or spider antelope horns, is a species of milkweed native to the Southwestern United States and northern Mexico.
It is a perennial plant growing to 0.3–0.9 m (1–3 feet) tall, with clustered greenish-yellow flowers with maroon highlights. It blooms from April through June.
Asclepias asperula is divided into two subspecies: asperula and capricornu (also known as var. decumbens), with the latter occurring in moister conditions and having ...