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Key to Pyrus

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1 Pome pyriform (pear-shaped!); pome with the sepals persistent; flowers 2.5-3 cm across; styles 5; [subgenus Pyrus]
1 Pome subglobose; pome with sepals caducous (or persistent in P. serrulata); flowers either 1.5-3.5 cm across; styles 2-5; [subgenus Pashia].
  2 Pome 3-10 cm in diameter; styles (4-) 5; flowers 2.5-3.5 cm in diameter
  2 Pome 0.5-1 cm in diameter; styles 2-4; flowers 1.5-2.5 cm in diameter.
    3 Pome 1.5-2.2 cm in diameter; styles 3 (-4); pome with sepals persistent
    3 Pome 0.5-1.2 cm in diameter; styles 2-3 (-4); pome with sepals caducous.
      4 Pome 0.5-1.0 cm in diameter; styles 2-3; leaf margins sharply serrate; pedicels tomentose, becoming glabrate; leaves tomentose when young, becoming glabrous above when older, but the lower surface retaining some hairiness (glabrate)
      4 Pome 0.8-1.2 cm in diameter; styles 2 (-4); leaf margins serrate-crenate; pedicels glabrous