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Key to Ranunculus, Key B: subgenus Auricomus; section Flammula (simple-leaved buttercups) (Spearworts)

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1 Petals 1-3 (-5); petals 1-2 mm long, about as long as the sepals; annual
1 Petals (4-) 5-9; petals 2-8 mm long, distinctly longer than the sepals; annual or perennial.
  2 Lower stem leaves 6-14 cm long; sepals 4-7 mm long; achene beaks 1.0-1.3 mm long
  2 Lower stem leaves 1-6.5 cm long; sepals 1.5-4 mm long; achene beaks 0.1-0.6 mm long.
    3 Achenes 0.8-1.0 mm long, lower stem leaves ovate to lanceolate, 4-24 mm wide.
    3 Achenes 1.2-1.6 mm long; lower stem leaves linear to lanceolate, 0.4-8 mm wide.
      4 Leaf blades 2-8 mm wide; stems 0.5-2 mm in diameter; sepals 2-3 mm long
      4 Leaf blades 0.4-1.5 mm wide; stems 0.2-1.0 mm in diameter; sepals 1-2 mm long