Apparently more than one Oxalis has that property; the redwood sorrel is also called "sourgrass" for the same reason. Funny that an Oxalis is called buttercup. Common names are so random.
I know it's not the scientific name but I call that sour grass. It comes in every year about this time. You can eat the whole stem and flower and it has a crazy sour taste like sour candies.
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