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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 Ligusticum

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1 Fruits ca. 1.5-2× as long as wide; leaves thin in texture, with 11 or more leaflets; [inland forests, woodlands, and glades, MD, PA, and OH southwestwards]
1 Fruits ca. 3× as long as wide; leaves somewhat fleshy, with 9 or fewer leaflets; [maritime situations, from Long Island, NY northwards]
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