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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