Erechtites hieraciifolius
Photo taken in Tokyo, Japan
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Asterales
Family:	Asteraceae
Genus:	Erechtites
Species:	E. hieraciifolius
Binomial name
Erechtites hieraciifolius (L.) Raf. ex DC.
Synonyms[2]
Synonymy Erechtites hieracifolius (L.) Raf. ex DC.[1] Erechtites hieraciifolia (L.) Raf. ex DC.[1] Erechtites hieracifolia (L.) Raf. ex DC.[1] Erechtites agrestis (Sw.) Standl. & Steyerm. Erechtites cacalioides (Fisch. ex Spreng.) Less. Erechtites carduifolius (Cass.) DC. Erechtites praealtus Raf. Erechtites sulcata Gardner Gynura aspera Ridl. Gynura malasica (Ridl.) Ridl. Neoceis carduifolia Cass. Senecio carduifolius (Cass.) Desf. Senecio fischeri Sch.Bip. Senecio hieraciifolius L. Senecio hieracifolius L.[1] Gynura zeylanica Trim., syn of var. cacalioides Ptileris hieracifolia (L.) Raf. ex B.D.Jacks., syn of var. cacalioides Senecio cacalioides Fisch. ex Spreng., syn of var. cacalioides Sonchus agrestis Swartz, syn of var. cacalioides Erechtites megalocarpa Fernald, syn of var. megalocarpus

Erechtites hieraciifolius (fireweed, American burnweed, or pilewort) is a plant in the daisy family, Asteraceae.^[3] It is native to the Americas,^[4] but is found many places around the world having been introduced by human activity.^[5] such as in Hawaii, China, Europe and Southeast Asia.^[6][7]

Erechtites hieraciifolius is an annual herb with alternate, simple leaves, on thick, green stems. The leaves are serrated, and range from unlobed to deeply lobed, with the lobe pattern superficially resembling wild lettuces, which are in the same family but not closely related. When crushed, all parts of the species are aromatic. The flower heads are yellow or pink, borne in fall. The heads are followed by cluster of small, wispy achenes. The plant often branches and grows in a clump with multiple stems.^[4]

This species benefits from fire, and is often one of the earliest pioneer species of areas that have recently burned, hence some of its common names. It prefers moist sites but can handle gravelly soil and some degree of dry conditions. It also grows well in urban areas and around humans.^[4]

The flowers are pollinated primarily by wasps and honey bees (Apis mellifera). The seeds are wind-dispersed, and are used as a minor food source by birds.^[6]

• United States Department of Agriculture Plants Profile
• photo of herbarium specimen at Missouri Botanical Garden, collected in Brazil in 1964
• photo of herbarium specimen at Missouri Botanical Garden, collected in Peru in 1986
• photo taken by Gerrit Davidse, showing one specimen of Homo sapiens beside one specimen of Erechtites hieraciifolius

Media related to Erechtites hieraciifolia at Wikimedia Commons

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