Santolina chamaecyparissus nana (or perhaps compacta) has a more pungent aroma than the straight species.
'Weston' is a dwarf form that grows less than 1 foot tall. The silvery foliage is more ornamental than the species and has a strong pungent scent.
'Edward Bowles' has gray-green leaves and creamy-yellow flowers.
'Lemon Queen' has grows 2 feet tall, has green leaves and pale yellow flowers.
'Morning Mist' grows 15 inches tall, has grayish-waxy green leaves, bears yellow flowers, and tolerates wet, compact soils.
'Pretty Carrol' grows 16 inches tall, has gray leaves and bears yellow flowers.
'Primrose Gem' has green leaves and pale yellow flowers.
'Sulphurea' has gray-green foliage and pale primrose yellow flowers.