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1 Leaves connate at their bases (the opposing leaf bases connected by a flange of leaf tissue across the node); stems bearing scales; leaves 1-5-veined.
..2 Flowers and young fruits with 2 inflated bracteoles at the base; leaves dimorphic (with floating rosettes of spatulate leaves and submersed linear leaves) or monomorphic.
....3 Fruit margin distinctly winged, the wing nearly 0.1 mm wide, extending the entire distance from the summit to the base of the fruit; fruit globose
....3 Fruit margin either not winged or with a wing < 0.05 mm wide, narrowing toward the base of the fruit before ending above the base; fruit ellipsoidal, obovoid, or nearly heart-shaped.
......4 Fruit as wide as long, obovoid or nearly heart-shaped