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Key to Kallstroemia

Zygophyllaceae

Kallstroemia

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1 Terminal pair of leaflets smaller or about the same size as lower pairs (the leaf thus elliptical or elongate in outline).
  2 Pedicels shorter than subtending leaves; sepals deciduous; petals yellow, 3-6 mm long, 2.5-3 mm wide
  2 Pedicels usually longer than subtending leaves; sepals persistent; petals orange, 5-12 mm long, 3.5-5 mm wide
1 Terminal pair of leaflets largest (the leaf thus obovate in outline).
      4 Leaflets densely hirsute; sepals subulate and clasping the fruit; beak (the persistent style) 1-4 mm long; [native, TX westwards and southwestwards]