Thin Hairy Rough-leaf GoldenrodSolidago rugosa var. rugosa
Asteraceae — Aster family
Bucktoe Creek Preserve (PA)
White Clay Creek State Park -- Possum Hill
Paper Mill Park
Middle Run Valley Natural Area
Per the Delaware flora checklist, var. rugosa has "thin hairy leaves".
Guide to Solidago of Delaware
Photos copyright David G. Smith
Information from the Delaware Flora Checklist used with author's permission.