Fireweed

Chamerion angustifolium

Find more about this plant on Wikipedia.

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By Stefan Laarmann - Own work, CC BY 2.5, https://commons.wikimedia.org/w/index.php?curid=952795 -

Willow herb is often used as a domestic herbal remedy, though it is little used in conventional herbalism. The herb is antispasmodic, astringent, demulcent, emollient, hypnotic, laxative and tonic. It is used in the treatment of diarrhoea, mucous colitis and irritable bowel syndrome. The plant is used in Germany and Austria to treat prostate problems. A poultice of the leaves is applied to mouth ulcers. An extract of the leaves has anti-inflammatory activity. An ointment made from the leaves has been used to soothe skin problems in children. A tea made from the leaves and roots is a folk remedy for dysentery and abdominal cramps. A poultice made from the peeled roots is applied to burns, skin sores, swellings, boils etc. Source: https://pfaf.org/