Solidago orientalis (Nesom) Nesom is native to eastern Mexico. It is similar to S. wrightii but has stem leaves that are serrate and phyllaries that tend to be broader.  Nesom originally describe the species as a variety of S. wrightii.  The chromosome number is unknown.

Solidago orientalis range Semple draft

Solidago orientalis was included in a multivariate study of Solidago subsect. Thyrsiflorae and found to be statistically distinct (Semple et al. 2017).  Solidago orientalis and S. buckleyi are the only two species in the subsection that consistenly have well developed serrations on lower and middle stem leaves.