Eastern Stiff-leaved Goldenrod
Solidago rigida ssp. rigida is distinquished by its glabrate to sparsely strigillose, oblong and rounded inner phyllaries (Semple & Cook 2006 FNA). The subspecies is similar to S. rigida subsp. humilis. It occurs on prairies, glades, oak savannas, dry open areas especially on calcareous soils, disturbed grounds (railroads, etc.) from Minnesota to New England south to Texas and scattered south to North Carolina further east (see map S. rigida). The subspecies is tetraploid 2n=36 throughout its range with a few diploids 2n=18 reported from Oklahoma.