Easiest way to plot a variable sized tree/hierarchical list programmatically?

Hi,
I am looking for tips on how to plot a tree structure of variable dimensions in R.
I have started looking into diagrammr, but I am not sure how to get it to deal with data that is variable. The examples that I have found use static data. I am expecting to use recursion on a snapshot of a variable dataset, and to summarise it a a collection of shapes. Any links to example code? Thanks!

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