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 .