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Key to Tagetes

Asteraceae

Tagetes

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1 Rays inconspicuous, ca. 1-2 mm long; [plant (at least historically) a well-established weed, primarily in the Coastal Plain]
1 Rays showy, mostly > 10 mm long; [plant cultivated, rarely occurring as a waif].
  2 Peduncles conspicuously swollen and hollow below the flower; involucre 15-20 mm high; achenes 7-10 mm long
  2 Peduncles not conspicuously swollen and hollow below the flower; involucre 10-15 mm high; achenes 4-7 mm long