Baccharis salicifolia is a blooming shrub native to the desert southwest of the United States and northern Mexico, as well as parts of South America. Its usual common name is mule fat; it is also called seepwillow or water-wally. This is a large bush with sticky foliage which bears plentiful small, fuzzy, pink or red-tinged white flowers which are highly attractive to butterflies. The long pointed leaves may be toothed. It is most common near water sources.
Most plants accumulate potassium preferentially over sodium, but Saltwort accumulates significant amounts of sodium into its structures. This means that its ashes produce a sodium-rich soda ash rather than a potassium-rich potash. The sodium compounds are useful in glassmaking (see soda lime glass) thus it is also known as glasswort.
The KayentaNavajo people use this plant in a compound infusion of plants used as a lotion for chills from immersion.