Plume poppy

Macleaya cordata (plume poppy, tree celandine), of the poppy family, is a robust, clump-forming herbaceous perennial reaching 2–2.5 m tall and spreading by rhizomes. The stout, hollow, glaucous stems and the large, heart-shaped to broadly lobed leaves (up to 25 cm across) are grey-green above and downy white beneath. Like other poppy relatives, the plant contains an acrid, orange-yellow latex. In summer it produces large, airy terminal panicles of numerous small, petalless, buff-white to creamy flowers, each with conspicuous stamens, followed by flattened obovate seed capsules. It is native to China and Japan, where it grows in open woodland, scrub, grassy slopes, and disturbed ground; it self-seeds freely and is widely cultivated as an ornamental, sometimes escaping to become weedy.