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| 1 |
Stems and leaf faces densely hairy, leaves spatulate to broadly ovate into arrays (rock houses, Kentucky) |
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26 Solidago albopilosa |
| + |
Stems and leaf faces glabrous or moderately hairy, distal leaves narrowly lanceolate or narrowly elliptic |
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(2) |
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| 2 (1) |
Involucres 8–13 mm; ray florets 5+ or more |
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(3) |
| + |
Involucres (6.5–)7–8 mm; ray florets 5 or fewer |
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(5) |
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| 3 (2) |
Phyllaries attenuate, subequal, 1-nerved; n Quebec and Labrador to n Ontario, s to Catskill Mountains, New York |
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28 Solidago macrophylla |
| + |
Phyllaries acute to blunt, unequal, 3–10-nerved (at least inner); high elevation s Appalachian Mountains, North Carolina, Tennessee, Virginia |
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(4) |
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| 4 (3) |
Leaves not fleshy; inner and outer phyllaries 3–10-nerved; flowering late August–early September; mid to high elevations, North Carolina, Tennessee, Virginia |
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24 Solidago lancifolia |
| + |
Leaves fleshy and rubbery when fresh; inner phyllaries often 3-nerved, outer phyllaries 1-nerved; flowering October; high elevations, North Carolina,Tennessee |
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27 Solidago glomerata |
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| 5 (2) |
Cypselae glabrous; ray floret 1; Ouachita Mountains, along border of Arkansas andOklahoma |
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23 Solidago ouachitensis |
| + |
Cypselae sparsely to densely hairy; ray florets (1–)2–5; not restricted to Ouachita Mountains |
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(6) |
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| 6 (5) |
Stems flexuous; proximal mid cauline leaves petiolate, obovate |
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25 Solidago flexicaulis |
| + |
Stems straight; leaves sessile, lanceolate to elliptic |
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(7) |
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| 7 (6) |
Stems arching, glaucous, strongly anthocyanic; heads secund; proximal to midleaves lanceolate, 50–150 × 8–30 mm |
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21 Solidago caesia |
| + |
Stems erect, not glaucous, weakly or not anthocyanic; heads not secund; proxi-mal to mid leaves broadly lanceolate to elliptic, 36–180 × 10–60 mm |
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22 Solidago curtisii |
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