Solidago sect. Ptarmicoidei

(House) Semple & Gandhi

Sida 21: 756. 2004.

Basionym: Aster sect. Ptarmicoidei House Bull. New York State Mus. Nat. Hist. 254: 710. 1924
Synonyms: Undefined sect. Oligoneuron Small Oligoneuron sect. Ptarmicoidei (House) G. L. Nesom Oligoneuron (sect. Undefined) ser. Ptarmicoidei (House) G. L. Nesom Oligoneuron (sect. Undefined) ser. Xanthactis G. L. Nesom Corymbosae Torrey & A. Gray Solidago (sect. Undefined) ser. Corymbosae (Torrey & A. Gray) O. Hoffmann Solidago subg. Oligoneuron (Small) House Undefined sect. Unamia Greene
Treatment appears in FNA Volume 20. Treatment on page 162. Mentioned on page 108, 164, 166.

Leaves: basal (rosettes) usually present at flowering, largest; petiole bases or vasculature persisting on rhizomes; proximalmost cauline petiolate, often present but withered at flowering; proximal and distal usually with 1 prominent nerve (multiple nerves proximally in S. riddellii). Heads in flat-topped to rounded corymbiform arrays, sometimes glomerulate. Phyllaries striate with 3–7 nerves (except S. ptarmicoides), eglandular. Pappi bristles in 2 series (outer not clavate, inner longest, somewhat to strongly clavate).

Discussion

Species 6 (6 in the flora).

Selected References

None.

Key

1 Leaves, stems and peduncles moderately to densely short-hairy; distal cauline leaf bladesovate, flat, never folded along midrib Solidago rigida
1 Leaves, stems, and peduncles glabrous or sparsely hairy; distal leaf blades linear to lanceolate, sometimes folded along midrib > 2
2 Rays white (rarely cream); leaf blades linear, stiff, glabrous or sparsely hairy Solidago ptarmicoides
2 Rays yellow; leaf blades linear to linear-lanceolate, stiff or flexible, glabrous > 3
3 Rays 1–4, peduncles usually sparsely to moderately strigillose; Arkansas, Louisiana, Mississippi, Oklahoma, Texas Solidago nitida
3 Rays 6–12, peduncles glabrous or moderately strigillose; Manitoba, midwestern and Great Lakes states s to e Missouri > 4
4 Involucres (5.5–)6–8(–9) mm; proximal and mid cauline leaves usually 3-nerved (sometimes obscurely), the 2 prominent lateral nerves arising proximally and running alongside midnerve for some distance before abruptly diverging; heads usually 10–30(–50)(–100+ rarely, in aberrant plants); plants 30–60+ cm; rays occasionally lighter yellow with age (damp,interdunal hollows, limestone alvars, Michigan, Ontario) Solidago houghtonii
4 Involucres 4–6 mm; mid and distal cauline leaves not 3-nerved or if so then nerves parallel and not abruptly diverging; heads usually (10– on shorter stems)50–400; plants 40–120 cm > 5
5 Leaves flat, only 1 nerve prominent; arrays corymbiform; dunes, marshes, along rivers,Great Lakes area, New York to Illinois and Wisconsin Solidago ohioensis
5 Leaves folded along midrib and with (2–)3–8 prominent nerves at base; arrays somewhat paniculiform with rounded corymbiform branches; moist ground, sw Ontario toWisconsin and se Manitoba, sw to e Missouri Solidago riddellii
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
flat-topped +  and rounded +
John C. Semple +  and Rachel E. Cook +
(House) Semple & Gandhi +
decurrent +
Aster sect. Ptarmicoidei +
compound +  and simple +
rugulose +  and muricate +
not 2-lipped +  and actinomorphic +
yellow +  and white +
ampliate +
beaked +, 2-ribbed +  and 5-ribbed +
compressed +, narrowly obconic +  and cylindric +
fertile +  and bisexual +
fertile +  and bisexual +
North America +
resinous +
stipitate-glandular +, puberulent +, pilose +, glabrous +, glabrous or +  and sparsely densely scabrous strigillose or villous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
glomerulate +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.3 cm3 mm <br />0.003 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
campanulate;cylindric +
0.17 cm1.7 mm <br />0.0017 m <br /> (1 cm10 mm <br />0.01 m <br />) +
sessile +  and petiolate +
erect;spreading +
triangular +  and narrowly lanceolate +
linear-lanceolate +  and oblong or ovate +
unequal +  and rarely subequal +
2-carpellate +
persistent +
ovate-oblanceolate +
bearing subulate enations +, hairy +  and bristly +
strigillose +  and glabrous +
8 +  and 10 +
exalbuminous +
decumbent +  and ascending or erect +
appendaged +  and truncate +
papillate +  and smooth +
Undefined sect. Oligoneuron +, Oligoneuron sect. Ptarmicoidei +, Oligoneuron (sect. Undefined) ser. Ptarmicoidei +, Oligoneuron (sect. Undefined) ser. Xanthactis +, Corymbosae +, Solidago (sect. Undefined) ser. Corymbosae +, Solidago subg. Oligoneuron +  and Undefined sect. Unamia +
Solidago sect. Ptarmicoidei +
Solidago +
section +
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 />) +
tree +, shrub +  and subshrub +