Soda oppositifolia is a species of halophyte shrub native to the Mediterranean Basin.
This annual, woody plant can grow into shrubs up to 2 m tall. It has cylindrical-linear and opposed leaves. The flowers, which bloom from May to October, are hermaphrodite and have a size of 1 cm.
Salsola oppositifolia was first described by René Louiche Desfontaines and published in Flora Atlantica 1: 219. 1798.
This plant has been historically used, along with other Soda species, as a source of soda ash, in the manufacture of lye and soaps.