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Key to Solidago, Key E: Key to "tall goldenrods" -- with 3-veined stem leaves dominant and secund paniculiform inflorescences [subgenus Pleiactila; section Unilaterales (in part)]

Asteraceae

Solidago

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1 Upper stem (above the midpoint, up to the branches of the inflorescence) glabrous.
  2 Plants to 20 dm tall; basal leaves never present; mid-stem leaves averaging 4-6× as long as wide; upper stem usually slightly to moderately glaucous as well as glabrous; [widespread]; [subgenus Pleiactilis, section Unilateral, subsection Serotinae]
  2 Plants to 10 dm tall; basal leaves withering or not before flowering (if not, also keyed elsewhere), often with associated sterile offshoot with basal leaves; mid-stem leaves averaging 5-10× as long as wide; upper stem glabrous, green; [KY, TN, and MS westwards].
    3 Rootstock short and branched, not producing creeping rhizome; ray flower 5-8; receptacle lacking intercalated green bract (resembling phyllaries) inward from the ray; mid and upper stem leaves usually lacking axillary fascicle of smaller leaves; [subgenus Pleiactilis, section Unilateral, subsection Radulae]
    3 Rootstock producing creeping rhizome; ray flower 7-13; receptacle often with a few intercalated green bract (resembling phyllaries) inward from the ray; mid and upper stem leaves usually with axillary fascicle of smaller leaves; [subgenus Pleiactilis, section Unilateral, subsection Junceae]
1 Upper stem hairy (above the midpoint, up to the branches of the inflorescence), variously puberulent, strigillose to strigose, villous, or scabrous.
      4 Midstem leaf blade 1-4 (-5)× as long as wide, the base attenuated to a winged petiole (at least in leaves of the lower midstem(; plants 1-10 dm tall; [collectively in IL, MO, AR, and LA westwards, disjunct eastwards in KY, NC, SC, GA, and AL]
        5 Leaf margin coarsely serrate; midstem leaf blade mostly 1.3-2× as long as wide; leaf surfaces evenly short villous; [IL & MO south to AR]; [subgenus Pleiactilis, section Venosae, subsection Drummondiani]
        5 Leaf margin entire to finely serrate; midstem leaf blade mostly 2-4 (-5)× as long as wide; leaf surface vestiture appressed to scabrous; [subgenus Pleiactilis, section Unilateral, subsection Radulae].
          6 Leaf surfaces with appressed (strigillose) hair; upper stem vestiture densely strigose, the stems appearing grayish-green; rhizome long-creeping, the plants forming clonal patches; [OK and nc. TX westwards and northwestwards]
          6 Leaf surfaces scabrous; upper stem vestiture scabrous to loosely puberulent, the stems appearing green or dingy green; rhizome short (less commonly moderately creeping); [se. KS, OK, and TX eastwards]
      4 Midstem leaf blade 4-20× as long as wide, the base sessile and cuneate to rounded; plants 3-20 dm tall; [collectively widespread].
             7 Ray 2-8; midstem leaves 4-15 mm wide, mostly 6-20× as long as wide, either twisted at base or not.
               8 Larger mid-stem leaves lanceolate to narrowly elliptic, 7-10 cm long, 10-15 mm wide; leaves not twisted; [KY and s. IN]; [subgenus Pleiactilis, section Unilateral, subsection Canadensae]
               8 Larger mid-stem leaves linear to lance-linear, 2-9 cm wide, 2-7 (-10) mm wide; leaves either twisted at base or not; [either OK and westwards, or Coastal Plain from VA to FL west to TX and AR].
                 9 Leaves 4-9 cm long, 4-5 mm wide; [inland provinces, OK and westwards]; [subgenus Pleiactilis, section Unilateral, subsection Radulae]
                 9 Leaves 2-7 cm long, 2-7 (-10) mm wide; [Coastal Plain, VA to FL west to TX and AR]; [subgenus Pleiactilis, section Unilateral, subsection Tortifoliae]
             7 Ray 4-17 (-24); midstem leaves 5-30 mm wide, 4-12× as long as wide, not twisted at base.
                   10 Midstem leaves mostly 8-12× as long as wide.
                     11 Ray 10-15; [wet pine savanna and marsh habitats, Coastal Plain of NC, SC, GA, FL, AL, and MS]; [subgenus Pleiactilis, section Unilateral, subsection Tortifoliae]
                     11 Ray 7-11; [riverscour habitats, inland provinces of PA, MD, DC, VA, WV, IN, KY, TN]; [subgenus Pleiactilis, section Unilateral, subsection Canadensae]
                   10 Midstem leaves mostly 4-6× as long as wide; [subgenus Pleiactilis, section Unilateral, subsection Canadensae].
                       12 Mid-stem leaves serrate, the teeth 3-8 (-10) per side, the largest > 1.5 mm long; involucre 1.7-2.5 (-3.0) mm high.
                          13 Lower to mid-stem glabrous or sparsely pubescent
                          13 Lower to mid-stem moderately to densely pubescent
                       12 Mid-stem leaves entire to serrulate, the teeth usually 0-6 per side (up to 14); involucre (2.5-) 3-4.5 mm high.
                            14 Stem densely and closely villous-tomentose; leaves densely and evenly short pilose above and beneath; [western]
                            14 Stem short pilose to puberulent; leaves usually noticeably less hairy above than beneath and often darker colored above, with ascending-appressed hair on the upper surfaces; [collectively widespread].
                              15 Upper surface of the leaves moderately to densely pubescent with short, curved to spreading hair; [western]
                              15 Upper surface of the leaves sparsely to moderately roughened with minute bulbous-based hair (stouter and shorter than the hair on the lower surface), or glabrous except along the veins; [collectively widespread].
                                16 Inflorescence broad; upper stem leaves not reduced in size relative to the mid-stem leaves; [broadly eastern]