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Key to Hydrocotyle

Araliaceae

Hydrocotyle

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1 Leaves peltate, lacking a sinus extending to the attachment of the petiole.
  2 Inflorescence umbellate; leaves 1-4 (-7) cm wide
  2 Inflorescence verticillate or umbellate-verticillate (when first developing sometimes appearing merely umbellate); leaves 1-15 cm wide.
    3 Inflorescence compound, the main inflorescence axis with node which produce verticil or umbel of pedicellate flowers, the inflorescence node also producing branches which themselves produce verticil or umbel of flowers; leaves (1-) 4-15 cm wide, the blade characteristically held in a vertical plane
    3 Inflorescence verticillate, all the flowers borne sessile or on pedicel 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 pedicel 1-10 mm long
 Hydrocotyle tribotrys
      4 Flowers and fruits sessile or subsessile
1 Leaves not peltate, a sinus extending to the attachment of the petiole.
        5 Central leaf lobe notably more distinct than the other lobe (the sinus on either side extending 1/3 to 3/4 of the way to the petiolar attachment); stems and petiole fleshy
        5 Central leaf lobe not more distinct than the other lobe (the sinus on either side extending 1/10 to 1/4 the way to the petiolar attachment); stems and petiole filiform.
          6 Fruiting umbel on peduncle 1-3 mm long; leaves 10-50 mm wide; [native of bog, spray cliff, and other wetlands]
          6 Fruiting umbel on peduncle 9-24 mm long; leaves 5-30 mm wide; [exotic of lawns and other disturbed habitats].
             7 Leaves 5-lobed, 15-30 mm wide, pubescent
             7 Leaves 7-lobed, 5-13 mm wide, glabrous