Acorus americanus (Raf.) Raf.

Acorus americanus (Raf.) Raf.. Acorus americanus, the American sweet flag, is an emergent wetland plant native to the northern United States and Canada. This perennial plant has bright green blade-shaped leaves that arise directly from the rhizomes and sheath into each other at the base. Additionally the blades have 2–6 raised veins, and a swollen center when viewed in cross section. The foliage has a citrus-like spicy aromatic quality, and can be used to flavor beer. It is a flowering plant with inconspicuous flowers that are arranged on a lateral spadix and the fertilized flowers produce berries with a jelly inside. This plant is protected as a state endangered species in Pennsylvania.