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The package offers a dendrogram representation of series of labels, this is specially needed in Markov chain Monte Carlo clustering. If you have a dendrogram in your mind you can easily put series of meaningful labels in a matrix and heights in a vector, then convert them to a dendrogram abject.
Package details 


Author  Vahid PARTOVI NIA, Anthony Davison, and Arpit Chaudhary 
Maintainer  Vahid PARTOVI NIA <[email protected]> 
License  GPL (>= 2) 
Version  1.3 
URL  http://labeltodendro.rforge.rproject.org/ 
Package repository  View on CRAN 
Installation 
Install the latest version of this package by entering the following in R:

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