Common Blue Violet
There are herbicides that will kill clover but not harm your grass. Visit your full service garden center and ask for help. But, read the label yourself. You want a selective herbicide that will kill only what you want it to kill and not your grass.
Thank you for your response - so just to clarify clover and violets will respond to the same herbicide? No need to remove the rhizomes?
Read the label. If both are listed, it will work. If not, it will work only for the one listed. Rhizomes need not be removed.