Some flowers,despite their strong fragrance, actually possess essential oils in low percentages. Steam distillation does not produce optimum results. To improve the yield, a solvent (viz alcohol or hezene) is used to extract the essential oil. This type of extraction produces a waxy mass which is called Concrete (which contains the floral wax plus the essential oil. Steam distillation of Concrete produces 'Absolute'.
Chamomile - Matricaria grandiflorum
Champa - Michelia champaka
Jasmine - Jasmine grandiflorum
Rose - Rosa centifolia
Vanilla - Vanilla planifolia