Mar. 11, 2022

slender yellow woodsorrel, Oxalis dillenii

We all have often seen this popping up in and around our lawns. Well, that depends on what the definition of this is. There are numerous species of woodsorrel, many with these yellow flowers that look exactly alike. And so do the clover-like leaves. If ever there was a case where where being picky about the definition of this doesn't matter, this is it. There are three most common species, O. dillenii, O. stricta, and O. corniculata. The last has creeping stems. The first two are upright. Oxalis dillenii can be recognized by the deflexed stems on the seed pods. They droop but then hold the pods upright. All species are a tartly tasty nibble, but don't eat too much. That zing is oxalic acid, which in sufficient quantities can cause gout or other troubles. Maybe just leave them in the lawn, where they can fix nitrogen just like the clovers, and make things more fertile. Oxalis dillenii is a native that grows in all states except AK, CA, HI, ID, and NV, and in AB, NB, NS, ON, PE, QC, and SK. Lenawee Co MI, 9/12/11. Woodsorrel family, Oxalidaceae.