It's interesting that such a narrow slice that includes just enough of the leaves, and just enough of the center of the bloom with its unopened petals, can reveal the unmistakable character of a dahlia. Beautiful banner, Zoia.
Gigi, sadly not my Dinnerplate! I used to grow them but got tired of digging them in the Fall only to lose half of them inside over the winter. But they are very strong! They generally don't need staking. I spotted that one at a formal garden in Danvers MA