[1] Quincula is a monotypic genus of flowering plants in the nightshade family, Solanaceae.

[2] It is native to the southwestern United States as far east as Kansas and Oklahoma, as well as northern Mexico, where it grows in many types of open, dry habitat, including disturbed areas.

It is a perennial herb producing ridged, spreading stems up to half a meter long.

The bell-shaped calyx of sepals at the base of the flower enlarges as the fruit develops, becoming an inflated, lanternlike structure up to 2 centimeters long which contains the berry.

Phylogenetic studies suggest that Quincula is closely related to the small North American genus Chamaesaracha.