#silver_fir  any of various true firs having leaves white or silvery white beneath
  supertype:  #fir_tree__firtree__fir__true_fir  any of various evergreen trees of the genus Abies; chiefly of upland areas
  subtype:  #amabilis_fir__white_fir__whitefir__Pacific_silver_fir__red_silver_fir__Christmas_tree__Abies_amabilis  medium to tall fir of western North America having a conic crown and branches in tiers; leaves smell of orange when crushed
  subtype:  #European_silver_fir__Christmas_tree__Abies_alba  tall timber tree of central and southern Europe having a regular crown and gray bark
  subtype:  #California_white_fir__white_fir__whitefir__Colorado_fir__Abies_concolor__Abies_lowiana  medium to tall fir of central to western United States having a narrow erect crown and soft wood
  subtype:  #balsam_fir__balm_of_Gilead__Canada_balsam__Abies_balsamea  medium-sized fir of northeastern North America; leaves smell of balsam when crushed; much used for pulpwood and Christmas trees
  subtype:  #Fraser_fir__Abies_fraseri  small fast-growing but short-lived fir of southern Alleghenies similar to balsam fir but with very short leaves
  subtype:  #lowland_fir__lowland_white_fir__lowlandwhitefir__giant_fir__giantfir__grand_fir__grandfir__Abies_grandis  lofty fir of the Pacific coast of northwestern America having long curving branches and deep green leaves
  subtype:  #Alpine_fir__subalpine_fir__subalpinefir__Abies_lasiocarpa  medium-tall Rocky Mountain timber tree having a narrowly conic to columnar crown

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