Can either be Scaly, seen for example in Triangularis,
or Compact woody like, seen in Ariculata species or Oxalis Adenophylla.
Tubers are potato like and very small.
They are found in the species that can be eaten; oxalis tuberosa.
Oxalis with roots are regarded as subshrubs, and therefore does not have a dormant period.
However, apparently, they can shed their leaves for a few weeks,
or just die and grow as new from the seeds they shed.
A few examples of oxalis with roots are;
Rio de Janeiro, the succulent species as Oxalis Ortgiesii and Oxalis Corniculata.
Oxalis Acetosella var. coerulea DC Flora Danica