#blackwood_tree__blackwoodtree__blackwood  any of several hardwood trees yielding very dark-colored wood
  supertype:  tree  a tall perennial woody plant having a main trunk and branches forming a distinct elevated crown; includes both gymnosperms and angiosperms
  substance:  blackwood
  subtype:  lightwood__Acacia_melanoxylon  tall Australian acacia yielding highly valued black timber
  subtype:  logwood_tree__logwoodtree__logwood__campeachy__bloodwood_tree__bloodwoodtree__Haematoxylum_campechianum  spiny shrub or small tree of Central America and West Indies having bipinnate leaves and racemes of small bright yellow flowers and yielding a hard brown or brownish-red heartwood used in preparing a black dye
  subtype:  Avicennia_marina__black_mangrove__blackmangrove  a mangrove of the West Indies and the southern Florida coast; occurs in dense thickets and has numerous short roots that bend up from the ground

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