Solidago rigida subsp. humilis
(Porter) Heard & Semple
Family:
Asteraceae
[
Oligoneuron bombycinum
Lunell,
more
Oligoneuron rigidum var. humilis
]
FNA
Resources
John C. Semple, Rachel E. Cook in Flora of North America (vol. 20)
Stems
40-70(-90) cm, densely (less coarsely) hispid (30-70 hairs/mm
2
).
Leaves:
basal (often numerous), small, rarely exceeding 120 × 50 mm; faces densely (less coarsely) hispid (20-60 hairs/mm
2
); 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.
2
n
= 18.
Flowering Aug-Oct. Dry to mesic, often sandy or eroded, soils, prairies and open meadows, open grassy clearings in woods; 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.
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