oxalis

The oca (Oxalis tuberosa) is an oval-shaped root; the skin pale red, and the inside white.

It was oxalis, or sorrel, and sometimes the children nibbled the sour leaves, calling it sour-grass.

If you can find a dimorphic Oxalis it will be a new point, for all known species are trimorphic or monomorphic.

I have written to my gardener to send you plants of Oxalis corniculata (and seeds if possible).

Another tiny flower is very much like mother's treasured pink oxalis; but is only the bloom of wood sorrel.