Another thank you to Rosa, aka contemplar@Flickr, for sharing a photograph with BPotD (original | BPotD Flickr Group Pool). Like the previous time a photograph of Rosa's was featured, if you visit Rosa's weblog, Blog De Cheiros, you'll find an entry about this species with more photographs.
Montanoa hibiscifolia is commonly known as tree-daisy or, in Australia, the Anzac flower. Native to Mexico and Central America, it has been cultivated in a number of tropical areas. Unfortunately, it has become weedy in many places where it's been introduced for ornament including Hawaii (or read this PDF fact sheet), northern Queensland of Australia (PDF) and Zimbabwe.
Tree-daisy is a woody member of the aster family. It can reach heights of 8m (26 ft) and form dense stands. The link to the Hawaiian web page above shares more photographs of the plant, where you can more clearly observe that hibiscifolia, meaning “leaves of Hibiscus”, is well-deserved.
I looked at the Hawaiian photos, and I don't see the Hibiscus similarity. All the Hibiscus I can remember seeing had simple, entire, dentate leaves, certainly not the deeply lobed leaves shown for the tree-daisy.
8m! Somehow i just don't believe it.
Compare with images of Hibiscus esculentus
The difference between the species in Asteraceae will never stop to amaze me.....
wonders never cease now do they
I have been, from time to time a horticulturalist, working over much of Australia. "Anzac Flower" is a designation that I have never come across, for this or any other plant.
Don -- a search for site:au anzac flower "Montanoa hibiscifolia".