Original: Asclepias verticillata (Whorled Milkweed, or Horsetail Milkweed) is a species of milkweed which is used as a medicinal plant by Native American tribes and in Butterfly gardening.
Simplified: Asclepias verticillata (Whorled Milkweed or Horsetail Milkweed) is a particular kind of milkweed used as a medicinal plant.