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Key to Ruppia

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1 Peduncle (2-) 3-30 cm long, with 5-30 coils in fruit; [inland calcareous waters, IL, MO, and LA westwards]
1 Peduncle 0.05-1.7 (-2.5) cm long, with 0-3 (-4) coils in fruit; [brackish coastal and estuarine waters, throughout coastal portions of our area, NJ to FL to TX]