Ozothamnus obcordatus is commonly known as Grey Everlasting.
This species is in the daisy family and thus many individual flowers are crowded together to make a showy head. Butterflies are seen on these flowers. The individual flowers are tubular and would need a pollinator with long, probing mouthparts. Daisy pollen is often very spiky all over. This may aid in the pollen grains adhering to the insect's legs and mouthparts.

light microscopy
electron microscopy