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1 Plants annual or biennial; leaflets finely subdivided into narrow, nearly linear, segments, leaves thus 3-4-pinnate; peduncles 1-3 cm long, often shorter than rays; fruits 3–4.5 mm long, often curved, styles shorter than fruits
1 Plants perennial; leaflets coarsely toothed, sometimes slightly lobed, leaves 1-2-pinnate; peduncles 5-16 cm long, longer than rays; fruits ca. 2.5 mm long, not demonstrably curved, styles nearly as long as fruits