title: Suppress leaf labels in dendrograms
body: <p>I'm not an expert in cluster analysis and thus not really familiar with all the "special" contributed packages out there. Hence, I just used base routines as the did <a href="http://www.statmethods.net/advstats/cluster.html" rel="noreferrer">here</a> for a quick example I was asked to produce.</p>
  
  <p>The problem is that my dataset has roughly 7800 observations and thus the leaf labels are by far too manifold and clutter up the whole x-axis. So, how can I suppress the plotting of the labels? I'm guessing there must be some "exotic" parameter accessible via <code>par()</code> that controls this?</p>