As Medicine:
Two species of coltsfoot (Petasites frigidus and P. palmatus) plants are in the Gwich’in Settlement Area. They are used as a steam to treat chest conditions such as asthma, congested chest conditions or colds. Ruth Welsh said,
"... [when] your child has a cold... [and] you want something to steam in the child's room to break the congestion and help them sleep, this is one of the plants that we used for that purpose."
Source: Andre, Alestine, Nant'aih nakwits'inahtsìh (The Land Gives Us Strength) (2006)