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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 Scolymus

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1 Stem wings and leaf blades with margins little or not whitened and thickened; pappus of several scales; plant a biennial or perennial
1 Stem wings and leaf blades with margins white and thickened; pappus absent; plant an annual
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