Santolina Etrusca is a species within the genus Santolina, a group of small evergreen shrubs in the chamomile tribe. It is notable for aromatic, often densely silvery‑haired foliage and compact, button-like composite flowerheads. The flowerheads are borne on slender stems held above the leaves and appear in the UK from June to August. Plants in this genus characteristically lack ray florets, showing only the dense central discs.

Santolina Etrusca has aromatic, silvery foliage and button-like yellow or white flowerheads that appear June to August.

Santolina Etrusca

Santolina Etrusca | Silver‑haired Santolina

Santolina chamaecyparissus, known as cotton lavender or lavender-cotton, is a species of flowering plant in the family Asteraceae, native to the western and central Mediterranean.

Santolina chamaecyparissus, or cotton lavender, thrives in full sun and is hardy to H5, ideal for low-maintenance hedging and Mediterranean-style gardens.

https://en.wikipedia.org/wiki/Santolina_chamaecyparissus

Santolina chamaecyparissus

Santolina rosmarinifolia, the holy flax, is a species of flowering plant in the daisy family Asteraceae, native to south western Europe. It is a dense, compact evergreen shrub growing to 60 cm (24 in) tall and wide, with narrow, aromatic green leaves and tight yellow composite flowerheads carried on slender stalks above the foliage, in summer.

Santolina rosmarinifolia is a compact evergreen shrub with aromatic foliage, ideal for full sun in gravel gardens, borders, hedging, and coastal areas.