Info: Closeup of buds, sepals and receptacles / 2016-10-17 / Clinton, Michigan 49236 / License: Creative Commons (cc-by-sa-3.0) (Attribution, ShareAlike)
Caption: "Dahlia 'Yellow Gem', 2016, GEM, Formal Decorative, 4 ft #Perennial (McWHIRTER, 1914), USDA Hardiness Zone 8, M-FD-y Class(4002) Awards(1), Bloom Month 7, In Garden Bed V2 for 143 yearsListed as FD on ADS database. Looks like a pompom or a minature ball