Subfamilies of Papavaraceae:
Papavaroideae
- milky or colored latex sap
- large sepals enclosing the bud
- radial symmetry
- stamens usually many
Fumarioideae
- no latex
- sepals small, bractlike
- bilateral symmetry, outer petals with spurs, inner petals coherent
- stamens 6, 2 with 4 pollen sacs, 4 with 1 pollen sac