Yellow flowered species of Oxalis are pigs to ID, even in the hand. To start with, you need to look at the bases of the leaves for leafy outgrowths (inconspicuous in Oxalis perennans), and look at the root (impossible if you do not have a collecting permit). Then it gets more complicated. Oxalis perennans seed cases are extremely hairy. The seed cases in your photos appear to be hairless, so I don’t think it is that species.
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