[R] tree-drawing in R ?

[Oliver Kullmann]

Hello,

I wonder whether binary (rooted) trees with simple
labels (say, integers) can be drawn by some R-package?
Couldn't find one.
Just to make sure (since "trees" can be many things): I mean
those computer-science creatures, with roots and subtrees.

Thanks for your consideration in any case

Oliver

P.S. Perhaps there is some graph-drawing package? (Here a "graph"
consists of vertices and connecting edges.)