Painted leaf (Euphorbia cyathophora)

Single stem plant growing along coastal areas . The first plant I found I could not separate the flower petals from the leaf and wasn’t sure why. It really looks like painted onto the leaf. After a while I found more and many had the petals separated from the leaf.
It is native to the tropical areas of North America and South America . Introduced to Australia and is declared a weed along much of Australias east coast.