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1 Plant perennial via stolons; leaves orbicular, cordate at the base, broadly rounded at the tip, serrate; flowers obviously bilaterally symmetrical or asymmetrical; [section Irregulares]
..2 Stem erect, the leaves mostly or entirely basal, alternate (stem leaves opposite in Mitella); leaves long-petioled, > 4 cm long (except short-petioled or sessile and sometimes < 4 cm long in Micranthes).
....3 Basal leaves short-petioled or sessile, the petioles 0-1× as long as the blade; basal leaves cuneate or rounded at the base; leaf venation predominately pinnate.
......4 Leaves entire, serrate, or coarsely dentate.
....3 Basal leaves long-petioled, the petioles (1-) 2-5× as long as the blade; basal leaves cordate at the base; leaf venation predominantly palmate. {add to key Saxifraga (stolonifera)}
........5 Petals fimbriate; inflorescence a raceme; flowers on pedicels 1-2 (-5) mm long
............ ..8 Seeds winged, 1.3-1.5 mm long; leaves cleft < ½ way to base; hypanthium fused to the pistils only at their bases; stems normally with several petiolate leaves much like the basal leaves (though typically somewhat smaller)
............ ..8 Seeds papillose, echinate, smooth, or slightly ridged, 0.4-0.7 mm long; leaves cleft > ½ way to base (in Boykinia) or < ½ way (in Heuchera); hypanthium fused to the lower half or more of the pistils; stems with (in Boykinia) or without (in Heuchera) several petiolate leaves.
............ ....9 Stems normally with several petiolate leaves much like the basal leaves (though typically somewhat smaller); ovary with 2 locules; leaves cleft > ½ way to base