Monotypic Papaveraceae genera

Lamprocapnos spectabilis, commonly known as bleeding heart or Asian bleeding heart, is a species of flowering plant belonging to the fumitory subfamily (Fumarioideae) of the Papaveraceae (poppy family). It is native to Northeast China and the Korean peninsula; however, it has been introduced by humans into a larger area of Northeast Asia, including parts of Siberia, Russia and Japan.

Sanguinaria canadensis, bloodroot, is a perennial, herbaceous flowering plant native to eastern North America. It is the only species in the genus Sanguinaria, included in the poppy family Papaveraceae, and is most closely related to Eomecon of eastern Asia.

Hunnemannia is a monotypic genus of flowering plants in the poppy family Papaveraceae, containing the single species Hunnemannia fumariifolia (tulip poppy or Mexican tulip poppy) native to the highlands of Mexico. It is typically found at elevations of in the Chihuahuan Desert and south into central Mexico, where it favors rocky habitats, occurring along roadsides as well.

Eomecon is a monotypic genus of flowering plants in the poppy family containing the single species Eomecon chionantha. Its common names include snow-poppy and dawn-poppy. It is native to China.

Hylomecon is a genus of flowering plants in the family Papaveraceae. Its species are native to China, Korea, Japan and the Russian Far East.

Platystemon is a monotypic genus of flowering plants in the poppy family containing the single species Platystemon californicus, which is known by the common name creamcups. It is native to Oregon, California, Arizona, Utah and Baja California, and is found in open grasslands and sandy soils below elevation.

Ichtyoselmis macrantha (also spelled Ichthyoselmis; formerly known as Dicentra macrantha; large-flowered dicentra) is the only species in the genus Ichtyoselmis. It is a perennial plant growing from a long rhizome, native to woodland and glades at elevations of in northern Burma and southern China.

Pteridophyllum is a genus of flowering plant endemic to Japan. Its only species is Pteridophyllum racemosum. The genus was formerly placed in the mono-generic family Pteridophyllaceae, which is now included within the Papaveraceae.