These wonderful "Segmented" saguaros are unusual and it's like a saguaro arm that the growth
has stopped growing and then starts growing again several times. Some people call these
"Jointed Saguaro","Tinker Toy Saguaro"(end-to-end)
and Others say "Water-melon Saguaro".
Source: Webster's New World Dictionary - College Edition
Segmental (seg'ment't'l), adj,
1.) having the form of a segment of a circle.
2.) of, or having the nature of, a segment or segments,
3.) composed of segments.
Source: WordNet (r) 1.7
1: cause to undergo mutation; of cells
2: undergo mutation; "cells mutate"