The correct option is
A Caudex
- The caudex is the axis of the plant of palm or fern that has a stem as well as root.
- The excurrent stem has the axis that is prolonged to form undivided main stem or trunk as in conifers.
- Deliquescent is the branching in which stem is not figured out as in deciduous trees.
- Culm is an aerial stem of grass.
So the correct option is 'Caudex'