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Key to Eichhornia

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1 Leaves ovate; inflorescence a panicle
1 Leaves orbicular or reniform; inflorescence a spike.
  2 Plants rooted; stems elongate, with leaves spaced and alternate; petioles not inflated
  2 Plants floating (or stranded by dropping water levels); stems short, with leaves in a rosette with very short internodes; petioles inflated