Papaver heterophyllum, previously known as Stylomecon heterophylla, and better known as the wind poppy, is a winter annual herbaceous plant. It is endemic to the western California Floristic Province and known to grow in the area starting from the San Francisco Bay Area of Central Western California southwards to northwestern Baja California, Mexico. Its main habitat is often described as mesic and shady, with loamy soils such as soft sandy loam, clay loam, and leaf mold loam.

It is a member of the family Papaveraceae, the poppy family of flowering plants mostly found in the Northern Hemisphere. The name poppy originates from Early Old English popeġ, popaeġ, popæġ, or popei and is suspected to have previously come from Late Latin papavum, popauer.

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