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Key to Cosmos

Asteraceae

Cosmos

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1 Ultimate leaf segments < 1.5 mm wide; rays white, pink, purple, or lavender.
  2 Blades of the ray flowers 15-50 mm long
1 Ultimate leaf segments (2-) 3-10 mm wide; rays either pink, white, or purple, or yellow to red-orange.
    3 Rays pink, white, or purple
    3 Rays yellow to red-orange