The Collaborative International Dictionary
Hybridizable
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.
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.
Wiktionary
hybridizable
a. That which may be hybridized.