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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
..2 Inflorescence umbellate; leaves 1-4 (-7) cm wide
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].
image of plant
Show caption*© Sonnia Hill
............ 7 Leaves 5-lobed, 15-30 mm wide
image of plant
Show caption*© Gary P. Fleming
............ 7 Leaves 7-lobed, 5-13 mm wide
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