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Key to Cicuta

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1 Flowers usually aborting (if present, the fruits 1.5-2 mm long); axils of upper leaves bearing clusters of bulbils; leaflets with narrowly linear segments, usually < 5 mm wide
1 Flowers usually forming mature fruits 2-4 mm long; axils of leaves not bearing bulbils; leaflets lanceolate, usually > 6 mm wide.
  2 Corky-thickened ribs of the abaxial surface of the mericarp much narrower than the oil ducts in the intervals
  2 Corky-thickened ribs of the abaxial surface of the mericarps more-or-less equaling the oil ducts in the intervals.
    3 Schizocarp commissure not constricted; styles 0.8-1.9 mm long; leaflets 1-9-4.9× as long as wide
    3 Schizocarp commisure abruptly and unevenly constricted; styles 0.6-0.8 mm long; leaflets 2.9-9.7× as long as wide