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Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

Key to Hydrocotyle

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image of plant
Show caption*© Richard & Teresa Ware
1 Leaves peltate, lacking a sinus extending to the attachment of the petiole.
image of plant
Show caption*© Richard & Teresa Ware
image of plant
Show caption*© Aidan Campos
  2 Inflorescence verticillate or umbellate-verticillate (when first developing sometimes appearing merely umbellate); leaves 1-15 cm wide.
image of plant
Show caption*© Aidan Campos
    3 Inflorescence compound, the main inflorescence axis with nodes which produce verticils or umbels of pedicellate flowers, the inflorescence nodes also producing branches which themselves produce verticils or umbels of flowers; leaves (1-) 4-15 cm wide, the blade characteristically held in a vertical plane
image of plant
Show caption*© Gary P. Fleming
    3 Inflorescence verticillate, all the flowers borne sessile or on pedicels on the unbranched inflorescence axis; leaves 1-6 cm wide, the blade usually more-or-less in a horizontal plane.
      4 Flowers and fruits pedicellate, the pedicels 1-10 mm long
image of plant
Show caption*© Bruce A. Sorrie
      4 Flowers and fruits sessile or subsessile
image of plant
Show caption*© Herbert L. Amyx
1 Leaves not peltate, a sinus extending to the attachment of the petiole.
image of plant
Show caption*© Herbert L. Amyx
        5 Central leaf lobe notably more distinct than the other lobes (the sinuses on either side extending 1/3 to 3/4 of the way to the petiolar attachment); stems and petioles fleshy
        5 Central leaf lobe not more distinct than the other lobes (the sinuses on either side extending 1/10 to 1/4 the way to the petiolar attachment); stems and petioles filiform.
image of plant
Show caption*© Erik Danielson
          6 Fruiting umbels on peduncles 1-3 mm long; leaves 10-50 mm wide; [native of bogs, spray cliffs, and other wetlands]
          6 Fruiting umbels on peduncles 9-24 mm long; leaves 5-30 mm wide; [exotic of lawns and other disturbed habitats].
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