Original: Asclepias verticillata (Whorled MilkweedUSDA PLANTS Database, or Horsetail Milkweed) is a species of milkweed which is used as a medicinal plant and in Butterfly gardening.
Simplified: Asclepias verticillata (Whorled Milkweed or Horsetail Milkweed) is a particular kind of milkweed used as a medicinal plantWildflowers.