Portland Sea-lavender is another extremely rare plant in the UK and is now protected under Schedule 8 of the Wildlife and Countryside Act.

The cliffs of the Isle of Portland in Dorset are both internationally important for their geological interest and are also home to a rich limestone flora. The occurence of Portland Sea-lavender is entirely restricted to these cliffs where is it still easy to find.
Portland Sea-lavender is a member of the Plumbaginaceae family and has pinkish-lilac flowers which resemble those of Rock Sea-lavender, but differ in that they are borne in a dense, curved spray. The plant flowers from July to August.