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Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

Key to Solidago, Key G: Key to "ptarmicoid goldenrods" -- with corymbs [subgenus Pleiactila, section Ptarmicoidei]

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1 Rays white; leaves linear-lanceolate to linear-oblanceolate, the longer (10-) 15-20× as long as wide; pappus bristles slightly to strongly clavellate-thickened;
1 Rays yellow; leaves oblong, elliptic, obovate, or spatulate, 2-8× as long as wide; pappus bristles not clavellate thickened.
  2 Leaves of the midstem 1-7 mm wide, 10-20× as long as wide; ray flowers 1-4/head, disk flowers 7-13/head; [AR, OK, MS, LA, and TX]
  2 Leaves of the midstem 8-20 mm wide, 2-12× as long as wide; ray flowers 6-14/head; disk flowers 6-35/head; [collectively widespread].
    3 Leaves of the midstem 8-12 mm wide, 4-12× as long as wide; leaf surfaces, stems, and peduncles glabrous; [marshes, swamps, moist to wet prairies, of OH, IN, OL, MO, and AR (allegedly disjunct in nw. GA and e. VA].
      4 Leaves essentially planar, with only the midvein prominent; leaves straight to slightly curved, appressed to ascending
      4 Leaves folded along the midvein (conduplicate, V-shaped in ×-section), with 3-7 veins prominent from the base of the blade; stem leaves strongly recurved away from the stem
    3 Leaves of the midstem 12-20 mm wide, 2-3.5× as long as wide; leaf surfaces, stems, and peduncles glabrescent to densely pubescent; dry to moist prairies, glades, and savannas].
        5 Outer series of phyllaries glabrous on the back (glabrous to short-ciliate on the margin); leaf undersurface glabrous to somewhat hispid (0-20 hairs per square mm) (the margins and midrib beneath often more densely pubescent); stems glabrous to somewhat hispid (0-25 hairs per square mm)
        5 Outer series of phyllaries pubescent on the back (short-ciliate on the margin); leaf undersurface hispid (7-50 hairs per square mm); stems slightly to strongly hispid (10-70 hairs per square mm).
          6 Pubescence of the stems and leaf surfaces finely and densely hispid-strigose, > 50 hairs per square mm; plants usually 3-7 dm tall; flowering arrays compact; inner phyllaries linear, conspicuously strigillose
          6 Pubescence of the stems and leaf surfaces coarsely hispid, < 50 hairs per square mm; plants 6-15 dm tall; flowering arrays loose, more diffuse; inner phyllaries oblong and with a rounded apex, glabrate or sparsely strigillose
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