I found this plant!
Long Purple-flag
Patersonia occidentalis var. occidentalis

This clumping, long-leaved perennial species is not found along the cliffs of Jan Juc until one reaches the deep, wet, sandy soil pockets associated with the Southside heathland. Unfortunately it hasn't been seen there for a number of years, possibly due to successive lower annual rainfall. Fortunately it is still in cultivation within the area as a garden plant as well as in the seasonally wet, sandier coastal heaths toward Anglesea.

The leaves are long and mildly convex; sometimes with sparse hairs on the margins.
Flowers are a bright, deep purple and are formed on long stems held above the foliage with each flower opening for a short period before being replaced by the next one. Numerous flower spikes arise from each plant.

Indigenous uses as provided by the Wathaurung Aboriginal Corporation: Foliage used in basketry.

Plant form
Herb, Grass-like: spreading, Grass-like: tussock
Flowering season
Spring
Flower colour
Mauve
Leaf colour
Dark Green
Both sides of the leaf are one colour
Leaf shape
Linear, Grass-like
Leaf edge
Entire
Required Sunlight
Semi-shade, Full Sun
Other Features
Damp tolerant