What’s the rule for naming hybrids? The unchanging rule is an x 

is placed in front of the specific epithet if it’s a hybrid between 

two species of the same genus but

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If the hybrid is between two genera, the x goes in front of the 
genus name

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In the case of our bigeneric hybrid we just looked at,  the 
genus name combines parts of the names of the two parents 
involved, while the specific epithet honors a man involved in 
making the hybrid

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However, there are many hybrids where the parentage is not 
indicated by the hybrid name, as, for example, often happens 
in cultivars of hybrid origin

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So just remember the x is the important part of a hybrid name