Yellow Fireweed

Stems erect, usually unbranched, flowers yellow. Stems bear opposite sessile leaves. Leaves 1–3 in. long, serrate, widely lance-shaped. Flowers near stem top nod in bud, then become upright; 4 petals 1/2–3/4 in. long, widely oval, with notched tip. Tube 1 1/2–3 in. long, becomes seedpod. Grows in seeps, edges of lakes, streams, springs, at mid to high elevations. Epilobium is Greek and refers to the sepals and petals located on top of the long pod, the ovary tube.