#bark  tough protective covering of the woody stems and roots of trees and other woody plants
  supertype:  natural_covering__naturalcovering__covering__cover  a natural object that covers or envelops; "the fox was flushed from its cover"
  subtype:  cinnamon_bark.bark  cassia_bark  cinnamon_bark  magnolia.bark  tanbark  mezereum  canella_bark  cinchona_bark  cascarilla_bark  cascara_sagrada  winter's_bark  tappa  angostura_bark  cork  phellem
  part of:  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 of:  root_system__rootage  a developed system of roots
  part of:  branch  a division of a stem, or secondary stem arising from the main stem of a plant
  part of:  tree_trunk__trunk__bole  the main stem of a tree; usually covered with bark; the bole is usually the part that is commercially useful for lumber
     part of:  tree  a tall perennial woody plant having a main trunk and branches forming a distinct elevated crown; includes both gymnosperms and angiosperms

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