In Oxalis,
the modified stem grows vertically in the soil.
the stem or branch is horizontally spread on the soil with simple leaves and adventitious roots at every node.
the stem or branch is horizontally spread on the soil with palmate compound leaves and adventitious roots at every node.
modified adventitious roots and pinnate compound leaves are present at every node.
Oxalis has runner as its sub-aerial modified stem with trifoliate palmate compound leaves and adventitious roots at every node.