Something I thought about too NBates! I've found this site which shows the distribution throughout Australia, and more particularly, the areas in WA where it flourishes. It is considered a weed of course, even though many people, like me, think they are so beautiful.
QUOTE:
Distribution:
12,000 Ha in WA spread over the Esperance plains, Geraldton sandplains, Jarrah forest, Swan coastal plain and Warren regions.
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Life cycle:
Perennial. Flowers mainly from August to December. Seeds germinate in autumn and winter and grow slowly producing a pea sized tuber by its first summer. It continues growth during summer if moisture is available and becomes dormant in early winter. New leaves form in winter to spring. It normally takes several years before it flowers. Nodules from tubers behave similarly and increase in size before flowering. Large tubers produce leaves in winter and spring and flower from late winter to spring each year. The flowering stem collapses and the spathe dries out as the seeds mature. Top growth normally dies off by mid to late summer and growth resumes in autumn.
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http://www.herbiguide.com.au/Descriptions/hg_Arum_Lily.htm
There's a lot of deep discussions about the symbolic meaning of the Lily on this WS link, particularly by crabstick that you might find helpful too. (From post #84)
https://www.websleuths.com/forums/s...iller-1996-1997-Perth-Western-Australia/page6
And of course "Tammy" the lady picking flowers that was lead to Jane by the "giant" lily:
QUOTE:
"She had picked two when a giant flower twice the size of any others caught her eye, leading her off the road and a few metres into the scrub for a closer look."
https://www.pressreader.com/australia/the-west-australian/20160125/282149290328951
WAPOL wore Arum Lily pins after Jane was found.
The Devil's Garden Page 37:
"It is a simple symbol, on a tiny badge: the Arum lily, chosen after Jane's body is found."..... Each officer around 100 at the peak of the investigation - will wear it discreetly on their lapel."
Arum Lilies are incredibly hardy being a weed, but seem to thrive where there is swampy land, near river banks, small waterways. We had them growing wild in the hills of Perth near creeks.