Are Palmer's elm-leaf goldenrod and the smooth elm-leaf goldenrod real?

Here we use a dataset obtained exclusively from herbarium specimens to evaluate the status of Solidago ulmifolia var. palmeri, a morphologically subtle taxon potentially confined to Alabama, Arkansas, Mississippi, and Missouri. Neither morphological or phylogenomic analyses supported Solidago ulmifolia var. palmeri as a distinct taxon, and we suggest that this name should be discarded. The status of Solidago delicatula (formerly known as Solidago ulmifolia var. microphylla) was also assessed. Both morphological and phylogenomic analyses supported the species status of S. delicatula and we suggest maintaining this species at it's current rank.