Lysichiton americanus

Perennial herb with unpleasantly-scented, bright yellow arum-like flowers.

The plants have very large leaves and form a slowly spreading clump. They can be grown as a ground cover. Grows well by water or in the bog garden.

The plant is rich in calcium oxylate, this is toxic and if consumed makes the mouth and digestive tract feel as though hundreds of needles are being stuck into it.