Dodonaea species are widespread in Western Australia. The common name hop bush comes from winged fruits which resemble hops.
​A ‘dodonaea’ google search yields pages of links/advertisements for sticky hopbush Dodonaea viscosa, which is one of the most widely dispersed plants in tropical/temperate parts of the world. It is a renowned hedge species and is full of bioactive substances developed by the species to repel insects. The plant, which  originates from rangeland WA and further east was used by aboriginal people for pain relief and for shelters, because they retained their leaves.
Beer-deprived European settlers used it as a hop substitute to brew a bitter but acceptable beer. I wonder whether narcotic components gave the beer an extra kick? 
I found an introduced plant of Dodonaea viscosa subspecies angustissima at Birdwhistle Rock.

Dodonaeas are dioecious (male and female), wind-pollinated plants with simple leaves. Flowers are small and insignificant. The female has a single pistil clasped by sepals. Male flowers look more like normal flowers because they have large, almost stalkless twisted anthers on top of a base of outstretched sepals. Anthers split open to allow pollen to blow away to female plants.

As an aside, I heard much buzzing in a male rock sheoak tree recently. As sheoaks are also wind pollinated I initially thought that there was a nest inside. No! male flowers were being raided by honeybees frantically collecting pollen. I wonder whether chemical-rich dodonaea pollen repels them?

There are three species native to the Narrogin area.
From their location, I suspect that they  tolerate dry conditions and are long-lived
Dodonaea humifusa is an attractive ground hugging plant which occurs mostly on rocky red clay soil on the Granite trail. I haven't noticed fruit on these plants.

Dodonaea pinifolia is a small shrub with narrow leaves, which grows on rocky red loamy soil on the Claypit circuit.

I found broad-leaved Dodonaea bursarifolia as small shrubs, which were the only understorey plants under York gums at the Wickepin railway dam.

Pollinators attracted to nectar produced in a nectary at the base of the style transfer pollination to and from the stigma as they bend down to drink nectar. Flowers with long styles suit large pollinators like birds, while shorter ones are more suited to insects. Many grevilleas and hakeas have flowers in heads or groups.
​I spent an  hour watching insects watching a flowering Hakea lissocarpha, which has profuse groups of flowers with short straight styles and a strong almost cloying aroma. The flowers were alive with insects, which barged their way through the flowers in search of nectar. I saw 2 butterfly, three fly, two wasp, and two bee species, and a honeyeater.

Here are a few weird and wonderful species