Asclepias verticillata is an upright plant with very narrow, needle-like leaves on unbranched stems. It forms clusters of fragrant white blooms that are held in the upper leaf axils and on stem ends. Commonly referred to as Whorled Milkweed, this plant is rhizomatous and will spread. Whorled Milkweed is native to the eastern two thirds of North America. Asclepias verticillata is a host to Monarch caterpillars and it also makes a good nectar source.