[R] apply union function vectorially

[statquant2]

Hello everybody,
I have a list.array which is a list containing arrays, lets say 
list.array= list( c(1,2,3),c(5,6,7),c(1,4,6,7,8) );
I would like to apply the union function to those 3 vectors to get the union
of the three : [1,2,3,4,5,6,7,8]
I tried do.call(what=union,args=list.array) but this is not working...

Do you have a non loop solution for this ?

Regards
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