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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 Erigeron

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1 Ray flowers 0.2-1 mm long; plants annual from a taproot.
1 Ray flowers 3-10 mm long; plants annual, biennial, or perennial.
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