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 Mazus

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1 Plant perennial, with leafy stolons rooting at the nodes; corolla 13-26 mm long
1 Plant annual, not stoloniferous; corolla 7-10 mm long