Asclepias tuberosa
Photo by Phil Lucas
From Nearctica
Identification: Flowers bright orange, downward hanging petals sometimes darker than the projecting crown. Flowers arranged in rounded clusters. Family with a distinctive flower consisting of 4 petals hanging downward and a crown of 5 incurved horns. Fruit an elongate, pointed pod containing flattened seeds topped with silken parachutes. Stem hairy. Stem without milky sap. Leaves elongate, narrow, tapering at the apex, and base closely appressed to the stem. Plant 1 to 2 feet in height.
Flowering period: June to September.