Diplotaxis siettiana, known in Spanish as , is a species of flowering plant in the family Brassicaceae. It is endemic to Alborán Island in the western Mediterranean Sea, where it grows only around the helipad. The natural population became extinct in 1974, but was re-introduced in 1999. Its natural habitat is Mediterranean-type shrubby vegetation. It is threatened by habitat loss. References siettiana Endemic flora of Spain Matorral shrubland Critically endangered plants Critically endangered biota of Europe Plants described in 1933 Taxonomy articles created by Polbot