One could think butterflies were perched in the oxalis patch at first glance. A closer inspection was due as this was a curious sight to me and I do not recall ever having seen it prior to this past week. While there are at least two sub-species of oxalis with yellow/orange leaves, they do not have the magenta outline. Oxalis spiralis ‘Aurea’ (Golden oxalis) and Oxalis vulcanicola (‘Molten Lava’) are both members of the family and sport leaves that range in color from pale green, yellow, peach, and vibrant orange.
I thought it highly unlikely that a new sub-species just popped up in the midst of this patch. None of the pictures I saw had the magenta border. However, two natural factors may be at play here. One reference indicated oxalis leaves will turn yellow when they are overwatered. Since nature and not I water these plants, I have no control over that if it is the case. However, these seems to be healthy leaves differing only by coloring. Turns out the foliage on oxalis turns yellow during the dormant period as they age in perennials (mature). In annuals, they become yellow at the end of the life cycle. I went down to take a new look yesterday, and indeed, several more of the yellow and magenta leaves are in the patch, providing a stunning contrast to the “younger” leaves.
Will wonders ever cease? I certainly hope not.