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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 Eurybia, Key A: Eurybia asters with long petioles and cordate or subcordate blades

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1 Outer phyllaries squarrose-reflexed; rhizomes short or absent, the plants not forming extensive clonal colonies; [of rich slopes and bottomlands of the lower Piedmont of NC, SC, GA, and AL].
..2 Involucre (10-) 11-13 mm tall; phyllaries 36-50, ovate, elliptic, or lanceolate, acute to acuminate at the apex, squarrose in life, often only the innermost squarrose in dried specimens, the reflexed portion with a distinct hyaline margin; ray florets 7-15, blue or violet; [of the lower Piedmont of GA and AL]
..2 Involucre 7-10 (-12) mm high; phyllaries 46-75 (-90), oblong-lanceolate, acute, obtuse, or rounded at the apex, squarrose in life, generally remaining so in dried specimens, the reflexed portion herbaceous with a narrow hyaline margin or none at all; ray florets (7-) 16-20 (-30), white or lavender; [of the lower Piedmont of s. NC and SC]
1 Outer phyllaries appressed (or slightly and irregularly spreading); rhizomes long, the plants forming extensive clonal colonies; [of various habitats and distribution].
....3 Branches of the inflorescence glandular-pubescent; ray flowers purplish or bluish
....3 Branches of the inflorescence not glandular-pubescent; ray flowers white (sometimes fading pinkish or lavender with age).
......4 Plants with basal leaves on well-developed shoots separate from the flowering shoots; larger leaves with 15-30 teeth per side
......4 Plants without basal leaves on well-developed shoots separate from the flowering shoots; larger leaves with 5-20 teeth per side.
........5 Basal rosettes formed in fall, withering in the spring and not present when plants flower and fruit; leaves scabrous below, hirsute above; [plants of IN, IL, MO, MI, WI, and IA]
........5 Basal rosettes forming in the spring, withering in the fall just before, during, or after flowering and fruiting; leaves sparsely pubescent on upper and lower surfaces; [plants of OH, KY, TN, and AL eastwards]
..........6 Longest peduncle in inflorescence > 1.5 cm long; involucre 6.5-9 (-10) mm tall; ray florets (8-) 12-16 (-20), the ray portion (10-) 17-18 (-20) mm long; disc flowers (12-) 17-26; [mostly of high mountain forests, primarily over 1200 m in elevation]
..........6 Longest peduncle in inflorescence < 1.5 cm long; involucre (3.5-) 4.2-6 (-7.5) mm tall; ray florets 5-10 (-12), the ray portion (5-) 10-15 mm long; disc flowers 12-19 (-25); [mostly of lower elevation forests, primarily below 1200 m in elevation]
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