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).


North America.


Species 6 (6 in the flora).

Selected References



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
John C. Semple +  and Rachel E. Cook +
(House) Semple & Gandhi +
Aster sect. Ptarmicoidei +
North America. +
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 +