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FNA | Family List | FNA Vol. 20 | Asteraceae | Solidago

163b. Solidago Linnaeus sect. Ptarmicoidei (House) Semple & Gandhi, Sida. 21: 756. 2004.

Aster Linnaeus sect. Ptarmicoidei House, Bull. New York State Mus. Nat. Hist. 254: 710. 1924; Oligoneuron Small; Oligoneuron sect. Ptarmicoidei (House) G. L. Nesom; Oligoneuron ser. Ptarmicoidei (House) G. L. Nesom; Oligoneuron ser. Xanthactis G. L. Nesom; Solidago [unranked] Corymbosae Torrey & A. Gray; Solidago ser. Corymbosae (Torrey & A. Gray) O. Hoffmann; Solidago subg. Oligoneuron (Small) House; Unamia Greene

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).

Species 6 (6 in the flora): North America.

1 Leaves, stems and peduncles moderately to densely short-hairy; distal cauline leaf bladesovate, flat, never folded along midrib   72 Solidago rigida
+ Leaves, stems, and peduncles glabrous or sparsely hairy; distal leaf blades linear to lanceolate, sometimes folded along midrib   (2)
2 (1) Rays white (rarely cream); leaf blades linear, stiff, glabrous or sparsely hairy   73 Solidago ptarmicoides
+ Rays yellow; leaf blades linear to linear-lanceolate, stiff or flexible, glabrous   (3)
3 (2) Rays 1–4, peduncles usually sparsely to moderately strigillose; Arkansas, Louisiana, Mississippi, Oklahoma, Texas   77 Solidago nitida
+ Rays 6–12, peduncles glabrous or moderately strigillose; Manitoba, midwestern and Great Lakes states s to e Missouri   (4)
4 (3) 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)   76 Solidago houghtonii
+ 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 (4) Leaves flat, only 1 nerve prominent; arrays corymbiform; dunes, marshes, along rivers,Great Lakes area, New York to Illinois and Wisconsin   74 Solidago ohioensis
+ 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   75 Solidago riddellii

Lower Taxa


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