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Key to Sisymbrium

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1 Silique subulate, 80-150 mm long, appressed to the rachis; pedicels 1-3 mm long; petals 3-4 mm long
1 Silique linear, 30-100 mm long; spreading from the rachis; pedicels 5-20 mm long
  2 Distal cauline leaf blades with linear or filiform lobes; fruiting pedicels thicker than siliques above, the mature siliques 30-100 mm long; petals 6-8 mm long
  2 Distal cauline leaf blade with lobes broader, not linear; fruiting pedicels thinner than siliques above, the mature siliques 30-40 mm long; petals 2.5-4 mm long