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Key to Cabomba

Cabombaceae

Cabomba

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1 Floating leaves 5-17 mm wide; submersed leaves 3-6 per node (whorled); flowers pink to purplish
(c) Fleming, Gary P.
1 Floating leaves 0.5-3 mm wide; submersed leaves 2 (3) per node (opposite, rarely whorled); flowers either creamy white or pink to purplish.
  2 Stamens 3; carpels 1 (-2) per flower; floating leaves 0.5-1.0 (-1.2) mm wide; [rare introduction]
(c) Bradley, Keith
(c) Fleming, Gary P.
  2 Stamens (3-) 6; carpels (2-) 3 (-4) per flower; floating leaves 1-3 mm wide.