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Key C5: rooted aquatics with cauline leaves, compound or divided

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1 Leaves (or leaf-like adventitious roots) 1-pinnately compound or divided (with a central axis bearing pinnae, the pinnae not further divided).
  2 Leaves crowded at the upper end of the stem, supported by inflated branches
  2 Leaves (or leaf-like adventitious roots) spaced along the stem, no branches inflated.
    3 Emersed leaves diamond-shaped, the blade < 2× as long wide, serrate only in the upper portion of its length
    3 Emersed leaves lanceolate, the blade > 4× as long as wide, serrate along its length
1 Leaves dichotomously or otherwise complexly (2-3×) compound or divided.
      4 Plants bearing numerous bladder-like traps
      4 Plants lacking bladder-like traps.
        5 Leaves alternate; leaf segments complexly (but not dichotomously) branched.
          6 Leaf dissection 2-pinnate to 3-pinnate; flowers in racemes; petals 4, white
          6 Leaf dissection 2-ternate to 3-ternate; flowers solitary; petals 5, yellow or white
        5 Leaves opposite or whorled; leaf segments dichotomously branched.
             7 Leaves whorled; leaf segments entire or toothed with denticles.
               8 Leaf segments toothed with denticles
               8 Leaf segments entire
             7 Leaves opposite; leaf segments entire.
                 9 Leaves sessile
                 9 Leaves petiolate