Solidago tarda Mackenzie ex Small is a polyploid member of the S. arguta complex with 2n=54. It occurs in more xeric environments than S. arguta and is found mostly on coastal plains. The populations are scattered in two disjunct areas, one centering on New Jersey and the other in the southeastern U.S.The basal leaves are truncate, and the plants are rhizomatous (Semple & Cook 2006 FNA). The species was found to be morphological close to S. ludoviciana in a multivariate analysis of S. sect. Argutae (Semple et al. 2021).