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Key C2: rooted aquatics with basal leaves, compound or divided

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1 Leaves palmately 4-foliolate, with very clear differentiation of the long petiole from the 4 leaflets
  2 Plants usually attached to rocks in flowing water of streams and rivers; [mainly Piedmont, Mountains, Interior Low Plateau, and Interior Highlands]
  2 Plants in mud or soil of stagnant waters; [Coastal Plain]
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