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Key to Hydrocotyle

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Show caption*© Richard & Teresa Ware 1 Leaves peltate, lacking a sinus extending to the attachment of the petiole.

Show caption*© Richard & Teresa Ware   2 Inflorescence umbellate; leaves 1-4 (-7) cm wide  Hydrocotyle umbellata

Show caption*© Aidan Campos   2 Inflorescence verticillate or umbellate-verticillate (when first developing sometimes appearing merely umbellate); leaves 1-15 cm wide.

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  Hydrocotyle bonariensis

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  Hydrocotyle tribotrys

Show caption*© Bruce A. Sorrie       4 Flowers and fruits sessile or subsessile  Hydrocotyle verticillata

Show caption*© Herbert L. Amyx 1 Leaves not peltate, a sinus extending to the attachment of the petiole.

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  Hydrocotyle ranunculoides

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.

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]  Hydrocotyle americana

6 Fruiting umbels on peduncles 9-24 mm long; leaves 5-30 mm wide; [exotic of lawns and other disturbed habitats].

Show caption*© Sonnia Hill              7 Leaves 5-lobed, 15-30 mm wide  Hydrocotyle bowlesioides

Show caption*© Gary P. Fleming              7 Leaves 7-lobed, 5-13 mm wide  Hydrocotyle sibthorpioides