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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 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
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