Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       particles
         hadrons - composite particles
           mesons - bosonic hadrons
             b bbar mesons
               01 Upsilon(1S)
               02 chi(b0)(1P)
               03 chi(b1)(1P)
               04 chi(b2)(1P)
               05 Upsilon(2S)
               06 chi(b0)(2P)
               07 chi(b1)(2P)
               08 chi(b2)(2P)
               09 Upsilon(3S)
               10 Upsilon(4S)
               11 Upsilon(10860)
               12 Upsilon(11020)