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Key to Ratibida

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1 Disks ellipsoid-globular, 10-25 mm tall, 1-1.6× as long as thick; plant a fibrous-rooted perennial from a woody rhizome or caudex; rays 2.5-3.5 (-6.0) cm long; achenes smooth, lacking a pappus
1 Disks columnar, 10-70 mm tall, 2-4.5× as long as thick; plant a tap-rooted perennial; rays < 2 (-2.5) cm long; achenes ciliate and winged, crowned by a pappus consisting of 1 or more awn-teeth.
  2 Style branches of the disc flowers 0.5-1.4 mm long, the upper 2/3-3/4 stigmatic; ultimate leaf segments mostly > 1.5 cm long, 1-16 mm wide
  2 Style branches of the disc flowers ca. 1.8 mm long, the upper 1/2 stigmatic; ultimate leaf segments mostly < 1.5 cm long, 0.8-4.5 mm wide.
    3 Leaves bipinnatifid; cypselae pectinate-fimbriate on both margins; ray corollas mostly yellow to purplish yellow
    3 Leaves lyrate-pinnate; cypselae pectinate-fimbriate on adaxial margin; ray corollas mostly purple, sometimes with some yellow