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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 A: Key to "thyrsiflorous goldenrods" -- with stem leaves dominant and cylindrical inflorescences [subgenus Solidago, sections Thyrsiflorae (mostly) and an Erectae]

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1 Outer phyllaries appressed; [subgenus Solidago; section Erectae]
1 Outer phyllaries with squarrose tips; [subgenus Solidago; section Thyrsiflorae].
..2 Leaves oblanceolate-obovate, often short acuminate at the apex; mid-stem leaves 8-14 cm long, 18-40 mm wide, the margins sharply serrate on at least the upper 2/3
..2 Leaves narrowly to broadly elliptic (or less commonly slightly oblanceolate), acute at the apex; mid-stem leaves 3-8 (-10) cm long, 8-25 mm wide, margins entire to shallowly serrate on only the upper ½ to 2/3.
....3 Middle and inner series phyllaries glabrous, usually minutely glandular or resinous and shiny; mid and upper stem leaves usually narrowly lanceolate, rarely broadly lanceolate to ovate, green to shiny silvery; [MO to LA west to e. KS to se. and c. TX, disjunct in n. COA]
....3 Middle and inner series phyllaries sparsely to moderately strigose, sometimes minutely glandular; mid and upper stem leaves lanceolate-elliptic to ovate-elliptic; [NC to n. FL west to AL; e. KS, e. OK, c. TX westwards]
......4 Involucres at anthesis (6-) avg. 7.5 (-8) mm high; [NC to n. FL west to AL, disjunct in e. TX]
......4 Involucres at anthesis (4.3-) avg. 5.3 (-7) mm high; [e. KS, e. OK, c. TX westwards]
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