Dalton48 has both shown us that I have it right and provided us a translation of the legend

Black - Agrarian Party

Magenta - Citizen's Power

Cyan - Democratic Party of Russia

Purple - Communist Party of the Russian Federation (KPRF)

Burgundy - Union of Right-Wing Forces

Green - Liberal-Democratic Party of Russia

Light Blue - Just Russia (as in justice)

Red - Patriots of Russia

Aquamarine (?) - United Russia