This unusual color pattern is on a wild Dock plant. The entire set of leaves of this particular one are either yellow/green or white/green. Each leaf side a seperate color from the other side. The veinage is still the lovely light purplish-pink tone and although this particular plant has been cut several times it still grows beautifully.
What's up, dock? Maybe herbicide exposure is involved, or the repeated cutting back has had an effect.
Nooooo idea! This plant is extremely prolific in this particular area? It lines a trail that's been hiked for several years and is mowed twice yearly that I know of. I have never noticed any other like this in the entire location (not that I'm walking in circles looking...) but this one has come back for at least 3 years now.
