From A Wiki of Ice and Fire
The spiceflower is a scented flower found in the Dothraki sea that is used in perfumes. It is often paired with cinnamon when used as a perfume.
A Game of thrones
An older servant at Illyrio's manse anoints Daenerys Targaryen with spiceflower perfume prior to her introduction as a prospective bride to Khal Drogo.