Definitions for "Caudex"
The stem of a tree., esp. a stem without a branch, as of a palm or a tree fern; also, the perennial rootstock of an herbaceous plant.
The pulpy, water storing tissue at the center of all succulent plants.
The persistent base of perennial herbs, usually only the part above ground.
Keywords:  bonzai, tuber, basal, candidate, larger
a tuber like basal structure that gets larger with age making this type a good candidate to train as a bonzai