I've had that pink one. I liked it to start with but it spread like mad (both seed and root) and is difficult to eliminate. I think I've more or less got rid of it now, but there's always a bit more here and there.
'If you have a garden and a library, you have everything you need.'
I have fond memories of a cottage garden in the village where I grew up … it had pink oxalis alongside the garden path … so pretty .,, I looked forward to seeing it and the foliage looking like four-leaved clover on my way to school.
It’s not invasive … just an easy and attractive plant.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Yes the OP did only ask what it was, but they may have been put off keeping it, by comments about its invasiveness, which others have pointed out may not be true.
How can you lie there and think of England When you don't even know who's in the team
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
When you don't even know who's in the team
S.Yorkshire/Derbyshire border