Solidago rigida subsp. humilis

(Porter) S. B. Heard & Semple

Canad. J. Bot. 66: 1805. 1988.

Basionym: Solidago rigida var. humilis Porter in T. C. Porter and J. M. Coulter, Syn. Fl. Colorado, 63. 1874
Synonyms: Oligoneuron bombycinum Rydberg Oligoneuron canescens (Linnaeus) Small Oligoneuron rigidum var. humilis (Porter) G. L. Nesom S. bombycinum (Rydberg) Friesner S. canescens (Kuntze) Fernald S. jacksonii var. humilis (Porter) Beaudry S. parvirigida S. rigida var. canescens (Rydberg) Breitung
Treatment appears in FNA Volume 20. Treatment on page 163. Mentioned on page 164.

Stems 40–70(–90) cm, densely (less coarsely) hispid (30–70 hairs/mm2). Leaves: basal (often numerous), small, rarely exceeding 120 × 50 mm; faces densely (less coarsely) hispid (20–60 hairs/mm2); mid to distal lanceolate to ovate. Heads in tightly clumped, usually rounded arrays, 3–13(–23.5) × (3.5–)6–13(–18) cm. Peduncles densely hispido-strigose. Phyllaries: outer densely strigillose; inner often more nearly linear, 0.7–1.2 mm wide, conspicuously strigillose. Disc corolla lobes shallow, 0.9–1.2(–1.3) mm. Cypselae usually strigillose distally. 2n = 18.

Phenology: Flowering Aug–Oct.
Habitat: Dry to mesic, often sandy or eroded, soils, prairies and open meadows, open grassy clearings in woods
Elevation: 200–1900+ m



Alta., Man., Ont., Sask., Colo., Ill., Ind., Iowa, Kans., Mich., Mo., Mont., Nebr., N.Mex., N.Dak., Okla., S.Dak., Tex., Wis., Wyo.


Subspecies humilis is introduced in Illinois, Indiana, Michigan, and Ontario. The involucres are slightly smaller than those of typical variety.

Selected References


Lower Taxa

John C. Semple +  and Rachel E. Cook +
(Porter) S. B. Heard & Semple +
Solidago rigida var. humilis +
Alta. +, Man. +, Ont. +, Sask. +, Colo. +, Ill. +, Ind. +, Iowa +, Kans. +, Mich. +, Mo. +, Mont. +, Nebr. +, N.Mex. +, N.Dak. +, Okla. +, S.Dak. +, Tex. +, Wis. +  and Wyo. +
200–1900+ m +
Dry to mesic, often sandy or eroded, soils, prairies and open meadows, open grassy clearings in woods +
Flowering Aug–Oct. +
Canad. J. Bot. +
Oligoneuron bombycinum +, Oligoneuron canescens +, Oligoneuron rigidum var. humilis +, S. bombycinum +, S. canescens +, S. jacksonii var. humilis +, S. parvirigida +  and S. rigida var. canescens +
Solidago rigida subsp. humilis +
Solidago rigida +
subspecies +