I found this plant!
Coast Twin Leaf
Zygophyllum billardierei

This plant is reasonably uncommon across Victora but on our stretch of coastline there are a number of populations that are typically associated with coastal dunes overlying limestone (calcarenite).
Pairs of succulent 'Y' shaped leaves make this plant distinctive and easy to identify.
Flowering is at its peak in late winter-spring when masses of single, bright yellow 4-petalled flowers appear. These are followed in summer by fleshy, triangular seed pods that gradually dry out with the summer sun.
Whilst this plant is drought tolerant it can be short-lived, relying instead on its ability to produce large quantities of seed to maintain future generations.

Plant form
Groundcover, Herb
Flowering season
Spring, Winter
Flower colour
Yellow
Leaf colour
Light Green
Both sides of the leaf are one colour
Leaf shape
Elliptic
Leaf edge
Entire
Required Sunlight
Semi-shade, Full Sun
Other Features
Drought tolerant, Erosion control