View photos of the edible plant Oxalis violacea (Violet wood sorrel), profiled in the Wild Edible Series: Arkansas, Kansas, Oklahoma, and Texas.

Caution: I’ve found the bulbs of Oxalis violacea to be particularly acrid (oxalates). They should be simmered and rinsed prior to consumption.

A passage from Wild Edible Plants of Texas:

Sorrels found in Texas are comprised of three types: A) fibrous lateral roots, B) small bulb roots, and C) larger tuberous roots. The roots from the fibrous types are not particularly edible.