Roots also differ from roots in the arrangement of xylem and phloem, having a solid central strand of vascular tissue rather than a hollow cylinder of conducting tissue.

• 根和茎不同，它无叶绿素，没有芽和叶，木质部和韧皮部的排列顺序也不同，其内部为实心的维管组织，而茎的内部为中空的圆柱形输导组织。