[R] How to make flowchart in R?

[johannes rara]

I have a large dataset and I would like to make some kind of flowchart
from this dataset. The idea is to show rowcounts from data subsets:

                  data1
             rows= 100000
                     |
                    / \
                   /   \
      males          females,
  rows=500000   rows=500000
                          /\
                         /  \
                        /    \
         brown hair       white hair
         rows=25000    rows=25000

Any ideas how this can be done using R?

-J