hybridizable

from The Collaborative International Dictionary of English v.0.48

Hybridizable \Hy"brid*i`za*ble\, a.
   Capable of forming a hybrid, or of being subjected to a
   hybridizing process; capable of producing a hybrid by union
   with another species or stock.
   [1913 Webster]

         Hybridizable genera are rarer than is generally
         supposed, even in gardens where they are so often
         operated upon, under circumstances most favorable to
         the production of hybrids.               --J. D.
                                                  Hooker.
   [1913 Webster]