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Key to Gutierrezia

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1 Subshrub; stems minutely hispidulous; ray florets 2-8; disc florets 2-9
1 Annual; stems glabrous or minutely papillate-scabrous; ray florets 5-23; disc florets 7-48.
  2 Stems papillate-scabrous; cypsela hairs clavate; pappi of scales
  2 Stems glabrous; cypsela hair apices acute; pappi of scales or absent.
    3 Involucres (2-) 3.5-4.5 mm diam.; disc florets 10-48; cypselae sericeous, with hairs usually in dense lines and at least partially obscuring faces; pappi of distinct scales 0.2-0.5 mm long, rarely reduced
    3 Involucres 2-3 mm diam.; disc florets 7-13; cypselae strigose, with hairs not obscuring cypsela faces; pappi of fused crowns < 0.1 mm long