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See list of 6 genera in this family
  • 1a. Perianth 4-merous; petals absent; flowers with 4 or 8 stamens that are set in the notches of an 8-lobed disk; at least the lower leaves opposite
  • 1b. Perianth 5-merous; petals present; flowers with 5 or 10 stamens; leaves alternate or all basal (opposite in Saxifraga oppositifolia)
    • 2a. Petals conspicuously pectinately fringed [Fig. 904]; inflorescence a slender, simple raceme with flowers borne on short pedicels 1–5 mm long
    • 2b. Petals entire [Fig. 906]; inflorescence a raceme, panicle, cyme, or thyrse, or of solitary flowers at the tips of stems, the flowers variously arranged on short to long pedicels
      • 3a. Ovary 2-locular, the placentation axile; stamens shorter than to scarcely longer than the petals
        • 4a. Stems with leaves (note: these sometimes small but are not confined to branching points of the stem) [Fig. 906]; leaf blades lacking foliar crystals, with one or more of the following features: palmately lobed outline, with 1 or more lime encrusted pores, prominently ciliate along the margin, and/or entire through most or all of margin; seeds smooth, tuberculate, or papillate
        • 4b. Stems without leaves (note: bracts found on the main axis of the plant are only present at branching points) [Fig. 903]; leaf blades with foliar crystals, the principal ones crenate or dentate through much of the margin (except M. foliolosa), lacking all of the features present in 4a (except M. foliolosa, which is entire through most of the margin); seeds ribbed
      • 3b. Ovary 1-locular, the placentation parietal; stamens long-exserted beyond the petals

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 Show photos of:   Each photo represents one genus in this family.