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Key to Melampodium

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1 Annuals; ray corollas yellow-orange; leaves 4-15+ cm long
1 Perennials; ray corollas cream-white; leaves 1-5.5 cm long.
  2 Outer phyllaries connate 1/2-3/5 their lengths; ray blades 7-13 × 2.5-8 mm
  2 Outer phyllaries connate 1/6-1/3+ their lengths; ray blades 2-8+ × 1-3+ mm.
    3 Leaf blades linear-oblong
    3 Leaf blades linear