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1 Twigs not thorny; leaves involute or convolute in bud; leaves unlobed; [exotics, cultivated and persistent or escaping]; [section Malus]. | |
2 Leaves glabrous or nearly so; fruits small, < 3.4 cm in diameter ("crabapples"). | |
3 Twigs glabrous (or sparsely puberulent only when young); sepals deciduous in fruit; fruit 8-10 mm in diameter; [section Florentinae]. | |
4 Sepal lobes triangular-ovate, 3-5 mm long, equal to or shorter than the calyx tube; anthers white; fruits oblong or pyriform | |
5 Sepals deciduous in fruit; leaves (many on a tree, and not just on vigorous shoots) trilobed; [section Sorbomalus] | |
5 Sepals persistent in fruit; leaves unlobed or slightly trilobed (especially on vigorous shoots); [native, sometimes weedy]; [section Chloromeles]. | |
6 Fruit 20-35 mm wide; leaves often lobed on vigorous shoots; branches thorny. | |
7 Leaves permanently pubescent beneath; pedicels and hypanthium pubescent; [western, disjunct east to KY and MS] | |
7 Leaves glabrous or nearly so; pedicels and hypanthium glabrous or with scattered long hairs; [widespread in our area]. | |
8 Leaves elliptic to elliptic-lanceolate, 2.5-8 cm long, 1-4 cm wide, mostly > 2× as long as wide, subacute to obtuse at the tip | |
8 Leaves ovate to ovate lanceolate, 4-10 cm long, 2-7 cm wide, mostly < 2× as long as wide, acute to acuminate at the tip |