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Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

Key to Aphanostephus

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1 Hairs of the cypsela apically straight; annuals.
  2 Vestiture hispid to pilose; hairs of the stem spreading at a ca. 90 degree angle to the stem, the hairs thick-based and straight, 0.6-2.4 mm long; ray flowers 13-21
  2 Vestiture puberulent; hairs of the stem spreading to deflexed, thin-based, 0.2-0.6 mm long; ray flowers 26-35
1 Hairs of the cypsela either apically coiled or glochidiate (clustered at the tip and retrorse); annuals or perennials.
    3 Hairs of the cypsela glochidiate; perennials
    3 hairs of the cypsela apically coiled; annuals
      4 Leaves thickened, almost succulent; leaf vestiture dense, gray-felty; [FL, w. LA westwards, coastal]
      4 Leaves herbaceous; leaf vestiture not dense or gray-felty; [AR and w. LA, westwards, mostly non-coastal]
        5 Pappus of acute or awn-tipped scales, 0.4-2 mm long; leaves often pinnatifid or lobed throughout the plant; [s. TX]
        5 Pappus of coroniform scales, 0.1-0.3 mm long; leaves usually pinnatifid at base of plant, entire up the stem; [AR and w. LA, westwards, mostly non-coastal]
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