A flowering Whorled Milkweed stem with buds and narrow leaves in prairie vegetation. Species: Asclepias verticillata (Whorled Milkweed). Photographed at Prairieview Education Center in Crystal Lake, Illinois. Field photograph by Brian Woolman for Where’s Wildlife. Original file: Whorled-Milkweed-Flower-Plant-DSCN5009.jpg.