Shade ------ that is indeed oxalis. It is considered a 'weed' here in Australian gardens and lawns etc. I quite like them, as they typically have three leaves. But --- when they are in large enough quantities, and if we occasionally keep looking (with no time limit) ------ the chances are that you will eventually find at least 1 (among a lot of them) with four leaves, instead of three. So in my opinion, is as 'lucky' as finding as a four-leaf clover.
Although, there was one time when there was a particular patch ----- one plant of oxalis --- in one particular spot, where that particular one had a few four leaved ones ----- among a bunch of three-leaf ones. So ----- hard to say what the mechanism was ----- as in genetic or otherwise, that was making that particular one have a much better chance of producing four leave ones. But ---- it wasn't producing all four leaf ones ------ it was just producing at least some every once in a while. And this was surprising ----- because normally ----- it could take years and years and years before finding a four leaf one using the 'occasional look in the garden/lawn' approach.
And also - not all of the 'four leaf' ones (if we find) are necessarily 'perfect' in shape/form. Some may appear a bit off ----- as in not perfect symmetry ------ as in natural deformity, or genetic issue.
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