The bright red fruits of all our species are attractive and persist on the trees until birds get to them, which is usually not long.
1. Sepals, ovary, and winter-buds ± densely white-pubescent; leaflets ± soft-pubescent beneath; rare escapes from cultivation.
1. Sepals, ovary, and winter buds (outer scales) glabrous or sparsely pubescent; leaflets glabrous or glabrate over much or all of the surface beneath; native species.
2. Lateral leaflets (3.2–) 3.4–4.5 (–6.4) times as long as broad, ± tapered or acuminate to the sharp apex, usually completely glabrous at maturity; petals (2–) 2.4–3 mm long; pedicels and branches of inflorescence glabrous or nearly so; mature fruit ca. 5–6.5 mm in diameter, not glaucous even when dried.
2. Lateral leaflets 2.4–3 (–3.2) times as long as broad, ± abruptly acute to obtuse at the apex, often retaining some pubescence at least along midrib beneath at maturity; petals (2.7–) 3–4.5 mm long; pedicels and branches of inflorescence ± hairy; mature fruit ca. (6–) 8–10 mm in diameter, often becoming glaucous especially in drying.
All species found in Sorbus
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. September 25, 2017. http://michiganflora.net/genus.aspx?id=Sorbus.