WordNet sense 1 (showy tropical tree or shrub native to Madagascar; widely planted in tropical regions for its immense racemes of scarlet and orange flowers; sometimes placed in genus Poinciana):

flame tree, royal poinciana, Delonix regia, peacock flower, Poinciana regia

WordNet sense 2 (elaborately or excessively ornamented):

aureate, florid

WordNet sense 3 (not plain; decorative or ornamented):

fancy

WordNet sense 4 (richly and brilliantly colorful):

unrestrained

WordNet sense 5 (striking in variety and interest):

colorful, colourful