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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 Pimpinella

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1 Stems hollow, prominently ridged or angled in ×-section
1 Stems solid (sometimes becoming irregularly fistulose late in the season), terete or essentially so
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