Short-stemmed, perennial, mat-forming herbs, not armed, with long, ± leafy runners. Lvs in basal rosettes, sometimes in clusters scattered along runners or cauline, long-petiolate, pinnately 3-foliolate or rarely pinnate or 1- or 5-foliolate, dentate or crenate; stipules free in upper part and adnate to petiole below, persistent. Infl. of 1-several, small-to medium-sized, ☿ fls borne on slender peduncle arising from basal rosettes or in axils of runner lvs. Hypanthium with a central, convex, spongy receptacle (carpophore). Epicalyx segments leafy, entire to toothed. Calyx usually with 5 ± triangular and prominent sepals. Petals 5, ± obovate, usually white, rarely yellow. Stamens 10-30. Ovary superior; carpels 10-80; styles surrounded by hypanthium rim; ovules 1 per carpel. Fr. a head of many achenes in pits on surface of soft, fleshy, coloured receptacle, the styles deciduous at fruiting.