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Key to Prunus

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1 Flowers in elongate racemes of (12-) 20-many flowers; [black-cherries, subgenus Padus]
1 Flowers solitary, in fascicles, in umbellate or corymbose inflorescences, or in short racemes (P. mahaleb) of 1-12 flowers.
  2 Fruit glabrous; ovary glabrous or pubescent initially; flowers and fruit pedicellate, the pedicel > 4 mm long (except…)
    3 Stones globose, not 2-edged; sepals hairy or not; inflorescences subtended by leafy bracts arising from the same bud as the flowers (except P. pensylvanica, P. susquehanae, and P. pumila); [cherries, subgenera Cerasus and Lithocerasus]
    3 Stones somewhat to strongly flattened, 2-edged; sepals hairy on the upper surface (except P. domestica, P. insititia, and P. cerasifera); inflorescences without leafy bracts arising from the same bud as the flower; [plums, subgenus Prunus]
  2 Fruit densely velvety or puberulent; ovary densely velvety or puberulent; flowers and fruits sessile or on pedicel 0-2 mm long.
      4 Fruit scarlet-red, 0.8-1.5 cm in diameter; twigs densely tomentose; fruit and ovary glabrous or somewhat pubescent (but not velvety); leaves < 5 (-7) cm long; petals white (pink in bud), < 13 mm long; [subgenus Lithocerasus, section Armeniacocerasus]
      4 Fruit yellow, peach, or orange-colored, > 2 cm in diameter; twigs glabrous; fruit and ovary velvety pubescent; leaves > 5 cm long; petals white or pink, > 11 mm long.
        5 Leaves 8-15 cm long, > 4× as long as wide, falcate; fruit peach-colored, > 5 cm in diameter; [peach; subgenus Amygdalus, section Persica]
        5 Leaves 5-10 cm long, 1-1.5× as long as wide, not falcate; fruit yellow to orange, 3-5 cm in diameter; [apricots; subgenus Prunus, section Armeniaca].
          6 Twigs reddish-brown; fruits 3-5 cm in diameter, the flesh sweet when ripe
          6 Twigs bright green; fruits 2-3 cm in diameter, the flesh sour and/or bitter when ripe