Eurybia

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  1a. Basal leaf blades both cordate and borne on petioles
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    E. macrophylla

    2a. Leaf blades minutely stipitate-glandular (especially on distal portions); branches of capitulescence with minute stipitate glands; rays purple or at least purple-tinged
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    2b. Leaf blades eglandular; branches of capitulescence without glands (sometimes with sparse, tiny glands in E. schreberi); rays white
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      E. schreberi

      3a. Plants with vegetative tufts of leaves produced separately from the flowering stem; involucre slender-cylindric, 5.5–7.5 mm tall; leaves at base of plant relatively firmer, often with rectangular basal sinuses, with mostly 15–30 teeth per margin
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      E. divaricata

      3b. Plants without separate vegetative tufts of leaves; involucre funnelform, 5–6.5 mm tall; leaves at base of plant relatively thinner, with a V-shaped basal sinus, with mostly 6–15 teeth per margin
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  1b. Basal leaf blades not cordate, sessile or petiolate [Fig. 408]
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    E. spectabilis

    4a. Stipitate glands present on involucral bracts and branches of capitulescence; leaves basally disposed; plants of dry, sandy soils along the coastal plain
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    E. radula

    4b. Stipitate glands lacking; leaves chiefly cauline; plants of peatlands, shores, and moist soils of forests, more common in north-temperate, boreal, and cool, maritime climates

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