Oxalis weed or flower?

This tiny flower on the end of a fragile 15 cm long stem is less than one cm in diameter and less than one cm deep including the stamens. It waves around in the slightest of air movement and is difficult to capture in multiple exposures. The image was taken with an iPhone XR back camera and attached Moment macro lens. CameraPixels was used to focus bracket 40 images and Affinity Photo was used to focus align and merge the images.