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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 S: herbaceous dicots with opposite, simple leaves on the stem

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1 Leaves unlobed (though sometimes serrate or crenate)
1 Leaves palmately or pinnately lobed (leaves with cordate, sagittate, or hastate leaf bases and otherwise unlobed are treated as unlobed).
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