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).
Last revised 19 May 2025 by J.C. Semple
© 2025 J.C. Semple, including all photographs unless otherwise indicated
1-4. Solidago rigida ssp. humilis. 1. Habit, Semple & Brouillet 4469, Custer Co., South Dakota. 2. Tall stem with future biologist, South Dakota. 3. Inflorescence and pollinators, Semple 11410, Crook Co., Wyoming. Fruits, Morton & Venn NA14173 TRT, Alberta.