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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 Polygalaceae

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1 Corolla keel blunt, lacking a terminal crest or beak.
..2 Calyx persistent in fruit
..2 Calyx deciduous in fruit
1 Corolla keel appendaged, with a terminal beak, or lobed or tufted crest.
....3 Corolla keel with a conic or cylindrical beak
....3 Corolla keel with a lobed or tufted crest.
......4 Flowers in terminal spikes, racemes, or corymbs; plants annual or perennial
......4 Flowers axillary; plants perennial