Morphological and ecological evidence for a new infraspecific taxon of the wallflower Erysimum cheiri (Brassicaceae) as an indigenous endemism of the southwestern Mediterranean

The wallflower Erysimum cheiri is a horticultural cruciferous growing as garden-escaped with a wide distribution in West and South Europe. In Algeria, it is locally found on the northern cliffs of the National Park of Gouraya (Kabylia). The aim of this study is to compare the populations of E. cheiri identified in Algeria with those found in Mediterranean France.