Solidago sect. Ptarmicoidei
Solidago ohioensis
Ohio goldenrod
1–10+, erect, slender to stout (tall shoots), glabrous.
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).
basal often persistent, also present as new rosettes at flowering, tapering to winged petioles to 250 mm, blades narrowly ovate to lanceolate, 50–150 × 15–45 mm, apices obtuse to acute, faces glabrous;
proximal cauline similar, reduced distally (petioles becoming less developed);
distal sessile, blades prominently 1-nerved, ovate to lanceolate, 75–100 × 8–12 mm, much reduced distally, margins entire, flat, apices acute.
6.3–8.5 mm, glabrous;
bracteoles 3, linear to lanceolate, sometimes grading into phyllaries.
campanulate, 4–5 mm.
6–8;
laminae 4.6–5 × 0.5–0.7 mm.
8–20;
corollas 4–4.5 mm, lobes 0.6–1 mm.
striate with 3–7 nerves (except S. ptarmicoides), eglandular.
(14–18) in 3–4 series, broadly linear to ovate, unequal, obtuse, obscurely striate.
in flat-topped to rounded corymbiform arrays, sometimes glomerulate.
10–500+ in corymbiform arrays, branches glabrous.
(obconic) 1.6–2.2 mm, glabrous;
pappi 2.5–3 mm (apically clavate).
bristles in 2 series (outer not clavate, inner longest, somewhat to strongly clavate).
= 18.
Solidago sect. Ptarmicoidei
Solidago ohioensis
Species 6 (6 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Solidago ohioensis is most likely to be confused with S. riddellii, which has folded and multinerved leaves, and S. houghtonii, which has arrays with few large heads. Solidago ohioensis is found in the southwestern Great Lakes area and the flatlands region to the southwest. Hybrids between S. ohioensis and S. ptarmicoides occasionally occur where the two parents are sympatric. Those hybrids were described as S. ×krotkovii B. Boivin [Oligoneuron ×krotkovii (B. Boivin) G. L. Nesom] and can be similar to S. houghtonii.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Leaves, stems and peduncles moderately to densely short-hairy; distal cauline leaf bladesovate, flat, never folded along midrib | S. 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 | S. 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 | S. 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) | S. 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 | S. 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 | S. riddellii |
IL Wildflowers
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