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Sorbus
See list of 5 species in this genusSee the genus Aronia for discussion of intergeneric hybrids placed in the nothogenus ×Sorbaronia.
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1a. Leaf blades simple; calyx lobes deciduous in fruit
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1b. Leaf blades compound; calyx lobes persistent in fruit
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2a. Leaf blades with 3–7 pairs of leaflets; terminal leaflet much larger than the lateral leaflets, often lobed
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2b. Leaf blades with 11–17 pairs of leaflets; terminal leaflet ± similar to lateral leaflets, serrate
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3a. Branchlets, inflorescence, adaxial surface of leaflets, and hypanthium villous; bud scales villous, not glutinous
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3b. Branchlets, inflorescence, adaxial surface of leaflets, and hypanthium glabrous or some surfaces sparsely villous; bud scales glabrous or ciliate on the margin, glutinous
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4a. Leaflets acuminate at the apex, 3–5 times as long as wide [Fig. 871, R]; winter bud scales eciliate or sparsely ciliate; petals 3–4 mm long; pomes 4–7 mm wide
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4b. Leaflets acute to short-acuminate at the apex, 2–3.5 times as long as wide [Fig. 871, L]; winter bud scales ciliate; petals 4–5 mm long; pomes 7–10 mm wide
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Each photo represents one species in this genus.