Stout goldenrod , verge d’or squarreuse
Solidago squarrosa Muhl. is native to the northeastern US and adjacent Canada. The species is distinguished by it cylindrical involucres with squarrose phyllaries (Semple & Cook 2006 FNA) and is one of the most easily recognized species in subsect. Squarrosae. The species is diploid 2n=18.
The range shown below has some gaps that need confirmation, e.g. northern New York.
Solidago squarrosa was found to be one of the most distinct species in subsect. Squarrosae in a multivariate analysis including 14 species of the subsection focusing on the S. speciosa complex (Semple et al. 2017) and was strongly separated in a second analysis of just five species of subsection Squarrosae (Semple et al. 2017).