Western Stiff-leaved Goldenrod
Solidago rigida ssp. humilis (Porter) Heard & Semple is distinguished by its conspicuously strigillose hairy, often linear, inner phyllaries (Semple & Cook 2006 FNA). One the dry prairies plants tend to be much shorter than those of subsp. rigida. The subspecies is native to dry to mesic, often sandy or eroded, soils, prairies and open meadows, open grassy clearings in woods of the Great Plains and the foothills of the Rocky Mts. from Alberta to Wisconsin south to New Mexico and Oklahoma with a few disjunct populations further east in Illinois, Indiana and Michigan (see map S. rigida). The subspecies includes only diploids 2n=18.