Solidago rigidiuscula (Torrey & A. Gray) Porter. Phen: (Aug-) Sep-Oct. Hab: Limestone barrens. Dist: ON west to ND and WY, south to TN, LA, and TX; disjunct eastward in glade habitats to nw. GA (GANHP), TN (Chester, Wofford, & Kral 1997), KY, and possibly NC and SC. Semple et al. (2012) also mention occurrences as far east as the Carolinas; this requires additional assessment.
Origin/Endemic status: Native
Taxonomy Comments: Probably best accorded specific rank, following Semple et al. (2012).
Synonymy: = Il, S, Semple et al (2012), Semple, Tong, & Chong (2017a); = Solidago speciosa Nutt. ssp. speciosa var. rigidiuscula – Ar, FNA20; = Solidago speciosa Nutt. var. angustata Torr. & A.Gray – F, misapplied; = Solidago speciosa Nutt. var. rigidiuscula Torr. & A.Gray – C, G, GrPl, K1, K3, K4, Mo2, NcTx, Oh3, SE1, Tn, Tx; < Solidago speciosa Nutt. – RAB