Yellow? Is it mimosa you're looking for?
Acacia decurrens is one of the many trees that goes by the name 'mimosa'. Growing beautiful foliage and fragrant yellow flowers looking like pompoms, it is native to Australia where it's cultivated to make oils, absolutes, and waxes.
Like all floral waxes, mimosa wax is produced during the making of mimosa absolute. The flowers are put through a solvent extraction that creates a waxy substance called concrete, which is then washed out with alcohol to obtain two materials: the absolute and the subtly scented wax. It thickens formulas, as well as giving a nice, malleable texture to products.