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Key to Thymophylla

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1 Leaves not lobed, alternate.
  2 Plants appearing white, lanate to tomentose
  2 Plants appearing green, glabrous or sparsely hirtellous
1 Leaves thinly and pinnately lobed, alternate or opposite.
    3 Plants perennial or subshrubs; leaves opposite; ray florets 12-21
    3 Plants annual, leaves alternate; ray florets 50 or more.
      4 Leaves entire (linear to spatulate) or with 1-5 toothlike lobes; pappus of 10-12 unequal aristate scales
      4 Leaves with 7-15 linear lobes; pappus of 3-5 aristate or erose scales.
        5 Pappus of 3-5 aristate scales; [heavy soils or loams, often on limestone or in disturbed areas in c. TX to the Rio Grande, adventive further east]
        5 Pappus of 5 erose scales alternating with 5 longer awned squamellae (diminutive scales); [sandy soils near the Rio Grande]