https://www.minnesotaseasons.com/Plants/showy_goldenrod_complex.html
Showy Goldenrod Species Complex (Solidago speciosa complex) — Minnesota Seasons
Solidago speciosa complex is a native goldenrod group, distinct for stout unbranched stems, thick rigid leaves, dense club-like panicles, and late bloom.
showy goldenrodspecies complexsolidago speciosaminnesotaseasons