Fireweed

The reddish stems of this herbaceous perennial are usually simple, erect, smooth, 0.5–2.5 m high with scattered alternate leaves. The leaves are entire, lanceolate, and pinnately veined. A relative species, Dwarf Fireweed (Epilobium latifolium), grows to 0.3–0.6 m tall.
The radially symmetrical flowers have four magenta to pink petals, 2 to 3 cm in diameter. The styles have four stigmas, which occur in symmetrical terminal racemes.
The reddish-brown linear seed capsule splits from the apex. It bears many minute brown seeds, about 300 to 400 per capsule and 80,000 per plant. The seeds have silky hairs to aid wind dispersal and are very easily spread by the wind, often becoming a weed and a dominant species on disturbed ground. Once established, the plants also spread extensively by underground roots, an individual plant eventually forming a large patch.