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Key to Chaetopappa

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1 Plants branching at the base from a caudex, the branches ascending and forming a bowl-like shape; stems and foliage eglandular; disk flowers 33-106; cypselas 2-3-nerved
1 Plants not branching from a caudex; stems and foliage either eglandular or glandular; disk flowers 6-25; cypselas 5-10-nerved.
  2 Pappi in 2 series, with outer of scales and inner of bristles; involucre 2.5-4 mm tall; cypselas 5-6-nerved.
    3 Leaves minutely glandular; involucres 1.6-3.6 mm wide (pressed); ray flowers 5-13, disc flowers 6-15; central disc achenes functionally staminate, epappose; fertile achenes 1.6-2 mm long, ellipsoid, slightly compressed but subterete (or prismatic), 5 (-6)-nerved; pappus of 4-6 awnlike bristles 1.5-2.3 mm long and a series of narrow scales 0.1-0.8 mm long
    3 Leaves eglandular; involucres 3.5-5.5 mm wide (pressed); ray flowers 10-18, disc flowers 15-25; disc achenes all completely fertile, pappose; achenes 2.0-2.2 mm long, mostly narrowly obovate, flat, with a pair of thickened, whitish, lateral ribs (or one of the lateral ribs actually 2 closely set ribs); pappus of 6-8 thick bristles and a series of narrow scales (0.5-) 0.7-1.4 mm long
  2 Pappus in 1 series; involucre 3.5-4.5 mm tall; cypselas 8-nerved or 10-nerved.
      4 Pappus in the form of a minute and thickened ring
      4 Pappus in the form of a white-hyaline, erose-margined, asymmetric, and cuplike crown