For the first day of spring, our most widespread spring flower:
And arguably, one of the prettiest.
Or many, if you're a literalist. Each one (of many millions) is a stem bearing thousands of flowers. Ray flowers are the "petals" on the outside; the tubular stems in the centre are disk flowers. (Which seems a misnomer; since when are tubes disks?)
Just dandy; how many million dandelion flowers are there in your lawn today?