#root_system__rootage  a developed system of roots
  supertype:  system  a group of independent but interrelated elements comprising a unified whole; "a vast system of production and distribution and consumption keep the country going"
  part:  root  the usually underground organ that lacks buds or leaves or nodes; absorbs water and mineral salts; usually it anchors the plant to the ground
     part:  root_cap  thimble-shaped mass of cells covering and protecting the growing tip of a root
     part:  root_hair  thin hairlike outgrowth of an epidermal cell just behind the tip; absorbs nutrients from the soil
     part:  bark  tough protective covering of the woody stems and roots of trees and other woody plants

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