Euthamia caroliniana (Linnaeus) Greene ex Porter & Britton
Asteraceae (Composite Sunflower) Family
Fruit is achene (a seed which outer layer is fused to it).
The related E. tenuifolia is similar in every aspect except the linear leaf has a faint vein that extends parallel to the midvein on both sides. It should be noted that some botanists consider these species to be the same as goldenrod hybridizes easily and both plants reside in similar locations.