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Key to Rosaceae, Key A: Herbs and subshrubs with simple leaves

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1 Leaves crenate, unlobed; inflorescence of a solitary flower; [tribe Rubeae]
1 Leaves 3-9 lobed; inflorescences cymose.
  2 Leaves shallowly 7-9-lobed; petals 0; stamens 4.
  2 Leaves 3-lobed; petals 0 or 5; stamens 1 or many.
    3 Leaf blades 0.3-1.0 cm long and wide, deeply 3-lobed, each lobe further lobed or deeply toothed; petals 0; stamen 1; [tribe Potentilleae]
    3 Leaf blades 3-8 cm long and wide, 3-lobed, each lobe toothed; petals 5; stamens many; [tribe Colurieae]