• ​Most acacia flowers have no nectar, but rely on a scent and dazzling yellow colour to attract pollinators. I think that most pollination is done by pollen-collecting bees. Birds, flies (particularly hover flies), and pollen-eating wasps may also be involved. The taxonomy literature is so confusing, I couldn't work out which subgenus a species belongs to, or their pollinators.
• Most acacias secrete nectar from special glands on stems and phyllodes (flattened leaf-like stems) to attract ants, which keep parasites away.
• Despite producing thousands of flowers, relatively few produce their pea-like pods. I suspect this may be because the seed is very long lasting and requires fire to germinate. Some seeds have a fleshy part (aril) to attract ants, which take the seed down their burrows away from predators.
• Noongars collected acacia seeds as bush tucker. A wacky friend of mine was going to make a fortune selling acacia flour noodles - until weevils crawled out of the seeds:) .

​

Further reading
A Simple Botany of Wattles
Pollination Ecology of Acacias

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 

I have found three species, all on well-drained soils. Persoonia quinquinervis is a common root-suckering species, which occurs in large patches in Foxes Lair. I also found a similar species Persoonia trinervis at Candy Block.

Persoonia longifolia the definitive 'snottygobble, is graceful small tree that grows on gravel uplands in the Darling Range. "When opened, the small, sweet fruit is mucous-like and green hence the first part of its rather singular name.  The ‘gobble’ part apparently originated when pioneers observed pigs hastily consuming the fruit."
I have been trying to taste the disgusting looking but tasty drupe for years, but haven't managed to find one at the right stage