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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 Papaver

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1 Upper cauline leaves clasping the stem; [section Papaver]
1 Upper cauline leaves not clasping the stem.
..2 Flowers > 10 cm across; perennial; [section Macrantha]
..2 Flowers < 10 cm across; annual; [section Rhoeadium].
....3 Capsule 2-3× as long as broad; stigmatic lobes 5-9
....3 Capsule 1-1.5× as long as broad; stigmatic lobes 8-15