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Key to Diaperia

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1 Heads 1.5-2 mm high, 1× as high as wide; cypselas 0.5-0.6 mm long; plants densely sericeous, grayish silvery
1 Heads 2-4.5 mm high, 1-3× as high as wide; cypselas 0.7-1.2 mm long; plants sericeous to lanuginose, silvery to grayish or greenish.
  2 Heads ellipsoid to cylindrical, 3.5-4.5 mm high, 2-3× as high as wide; capitular leaves visible between and surpassing the heads; cypselas 0.9-1.2 mm long
  2 Heads campanulate to spherical, 2-3.3 mm high, about 1× as high as wide; capitular leaves more-or-less hidden between and surpassed by the heads; cypselas 0.7-0.9 mm long.
    3 Pistillate paleas individually visible through thin, silky pubescence; heads spherical, the largest 2.5-3.3 mm high
    3 Pistillate paleas collectively hidden by dense woolly pubescence; heads campanulate, the largest 2.0-2.5 mm long