Solidago rigida subsp. humilis

(Porter) S. B. Heard & Semple

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

Endemic
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

Distribution

V20-357-distribution-map.gif

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

Discussion

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

Selected References

None.

Lower Taxa

None.
not tailed +, rounded +  and obtuse +
distinct +
8 cm80 mm <br />0.08 m <br /> (20 cm200 mm <br />0.2 m <br />) +
subequal +
24mm +  and 50mm +
usually triangular +  and linear +
usually deltate +  and lanceolate +
13 cm130 mm <br />0.13 m <br /> (18 cm180 mm <br />0.18 m <br />) +
indeterminate +  and determinate +
rounded +
6cm +  and 13cm +
John C. Semple +  and Rachel E. Cook +
(Porter) S. B. Heard & Semple +
decurrent +
Solidago rigida var. humilis +
compound +  and simple +
3 cm30 mm <br />0.03 m <br /> (5 cm50 mm <br />0.05 m <br />) +
ovate;obtuse;acute +
reduced +
15mm;17mm +
rugulose +  and muricate +
linear-lanceolate +
not 2-lipped +  and actinomorphic +
yellow +  and white +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
ampliate +
0.43 cm4.3 mm <br />0.0043 m <br /> (0.61 cm6.1 mm <br />0.0061 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
compressed +, narrowly obconic +  and cylindric +
fertile +  and bisexual +
fertile +  and bisexual +
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 +
resinous +
8 cm80 mm <br />0.08 m <br /> (20 cm200 mm <br />0.2 m <br />) +
obtuse;acute +
2.4 cm24 mm <br />0.024 m <br /> (5 cm50 mm <br />0.05 m <br />) +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Dry to mesic, often sandy or eroded, soils, prairies and open meadows, open grassy clearings in woods +
glomerulate +
13 cm130 mm <br />0.13 m <br /> (23.5 cm235 mm <br />0.235 m <br />) +
indeterminate +
3 cm30 mm <br />0.03 m <br /> (13 cm130 mm <br />0.13 m <br />) +
heterogamous +  and homogamous +
each +  and sessile +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
campanulate +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.17 cm1.7 mm <br />0.0017 m <br /> (1 cm10 mm <br />0.01 m <br />) +
1.4mm;5.4mm +
1.2mm;1.9mm +
sessile +  and petiolate +
cauline +, proximal +  and basal +
50 cm500 mm <br />0.5 m <br /> (?) +
erect;spreading +
triangular +  and narrowly lanceolate +
8 cm80 mm <br />0.08 m <br /> (20 cm200 mm <br />0.2 m <br />) +
obtuse +  and acute +
2.4 cm24 mm <br />0.024 m <br /> (5 cm50 mm <br />0.05 m <br />) +
serrate +  and entire +
80mm;200mm +
undulate +, obtuse +  and acute +
24mm +  and 50mm +
linear-lanceolate +  and oblong or ovate +
unequal +  and rarely subequal +
2-carpellate +
persistent +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
hispido-strigose +
0.3 cm3 mm <br />0.003 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
Flowering Aug–Oct. +
obtuse +  and oblong +
ovate-oblanceolate +
Canad. J. Bot. +
bearing subulate enations +, hairy +  and bristly +
strigillose +  and glabrous +
8 +  and 10 +
exalbuminous +
1 +  and 10 +
40 cm400 mm <br />0.4 m <br /> (70 cm700 mm <br />0.7 m <br />) +
appendaged +  and truncate +
papillate +  and smooth +
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 +
100 cm1,000 mm <br />1 m <br /> (200 cm2,000 mm <br />2 m <br />) +
5 cm50 mm <br />0.05 m <br /> (100 cm1,000 mm <br />1 m <br />) +