Key to the genera Oreomecon, Papaver, and Roemeria

1 Annuals

2 Basal internode above leaf rosette robust, longer than overlying internodes, the node above producing a sort of second leaf rosette from which, when present, lateral stems branch off; capsule ovoid to linear, usually bristly .......................................................... Roemeria

2 Basal internode similar to the others, leaves never forming secondary rosettes, branches arranged along the stem; capsule never linear, glabrous ...... Papaver p.p.

1 Perennials

3 Leaves also on stems; capsule glabrous .. Papaver p.p.

3 Leaves only basal; capsule bristly ............ Oreomecon