Stylophorum diphyllum, commonly called the celandine-poppy or woods-poppy, is native to North America, where it is found in the eastern United States and Ontario. Its typical natural habitat is moist forests over calcareous rock and ravines.

It is cultivated for its bright yellow flowers. The common name is derived from greater celandine (Chelidonium majus), a closely related European plant with similar flowers and leaves.

In spring and early summer the deep yellow flowers of the celandine poppy appear as a brilliant display on the forest floor. The flowers have 4 yellow petals, and many yellow-orange stamens. Plants grow to about 1.5 feet (0.46 m) tall, from underground rhizomes. Leaves are cut and lobed.

Plants are relatively long lived and readily self-seed under garden conditions.

Stylophorum diphyllum is a conservative species, and is somewhat uncommon throughout its range. Forest clearance is responsible for some of the loss.

Due to its limited distribution in Canada, it is listed under Ontario's Endangered Species Act, 2007, which protects the species and its habitat. One Ontario population of the wood poppy is in a conservation area.

Type: Hardy perennial

Hardiness zones: 4-8

Height: 12-16", 30-45 cm

Location: Full shade to part shade

Seeds per packet: 25