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Key to Pelecyphora

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1 Mature plants with areolar grooves extending 1/2 - 3/4 of the distance from spines to axils of tubercles
1 Mature plants with areolar grooves extending full distance from spines to axils of tubercles.
  2 Floral remnant on fruit deciduous; spines 6-21 per areole; plants often profusely branched
  2 Floral remnant on fruit persistent; spines (21-) 27-51 (-60) per areole; plants profusely branched or solitary.
    3 Ripe fruit red, plants many-branched, individual stems 3-6 cm in diameter; [s. TX only]
    3 Ripe fruit green, plants usually solitary but occasionally many-branched in age, individual stems 2.5-20 cm in diameter; [north of s. TX]