Most goldenrods have yellow flowers, but a few species of Solidago have white petals, and at least one of those (S. bicolor) has the common name silverrod.  But perhaps we could call it platinum-rod, or palladium-rod, both metals having more of a white cast than silver.  Whichever precious metal we use for the name, the flowers are showy.  And the disk flowers are at least faintly yellow, like those in the rest of the genus (hence the species name bicolor?).  In the riot of blooming at this time of year, a little variety is just fine.