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Key to Citrus

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1 Leaves trifoliolate; fruit densely pubescent, 3-6 cm long
1 Leaves unifoliolate; fruit glabrous, 4.5-25 cm long.
  2 Petiole winged, and with an articulation at the juncture with the blade; fruit 4.5-15 cm long
  2 Petiole not winged, and lacking an articulation at the juncture with the blade; fruit 15-25 cm long