I am trying to identify this medium arching shrub growing to about 1.5m high x 2m wide in the subtropical climate of the Mt Coot-tha Botanic Gardens in Brisbane, Australia. Unfortunately there was no label with it. The inflorescence is about 3cm across, a greenish yellow, and made up of many tentacle-like florets. I don't think it is an Australian native plant.
Finally, I found the info about this plant:
Common name: Buttontree
Botanical name: Terminalia pendula
Family: Combretaceae (Rangoon creeper family)
Flowering: June - September
Buttontree is a moderate sized tree with small leaves, which fall early in the dry season. Before falling the foliage of these trees turns a beautiful yellowish red. The leafy branches are pendulous and hang down gracefully. Leaves upto 3 cm appear in nearly opposite pairs. Tiny yellowish green flowers occur in spherical heads about 1 cm wide. Protruding stamens are prominently visible like a fuzz on the round heads. Fruits are sort of circular, clustered in round heads.
Source: Terminalia pendula - Buttontree