I think it’s called Oxalis, not sure exactly which one. I haven’t been “infested” by it so can’t advise how to eradicate it. I’m sure someone with the appropriate knowledge will help.
@pclark42 the only way to get rid of it is by using weedkiller unfortunately. Digging it out is difficult as the roots are deep and if you leave even a tiny bit of root behind it regrows. It spreads by both seed and runners. The best time to spray with weedkiller is in spring with another treatment later in the year if needed.
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I dig it out sometimes but it's everywhere, so a losing battle.
Try to get to like it
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.