When and where did asclepias?

Asclepias, commonly known as milkweed, is a genus of flowering plants native primarily to North America. The genus is believed to have evolved around 50 million years ago. Milkweed species are particularly important for their role in supporting Monarch Butterflies, which rely on them for food during their larval stage. Asclepias plants can be found in diverse habitats, including prairies, meadows, and roadside areas across the continent.