Unsure whether "gefüllt" is hose-in-hose, double or double hose-in-hose, or all of these. "A wide array of flower types are found among the different types of azaleas. The four classifications of flower type are single, hose-in-hose, double and double hose-in-hose. A single flower features five to six petals around five stamens and one pistil, such as in the Kobai azalea. Hose-in-hose refers to azaleas featuring 10 to 12 petals, which includes the calyx. A double azalea features stamens that become petals, leading to a variable number of petals. Double hose-in-hose azaleas feature over 30 petals, exemplified by the azalea Balsaminiflorum."