\begin{tikzpicture}[>=stealth']
  \node (stem) at (0,0) {freem};
  \node (stemm) at (3,0) {bound};
  \node (ndstemm) at (6,1) {nposs};
  \node (nstemm) at (6,-1) {nposs};

  \draw[->] (stem) to node [fill=white] {\footnotesize $m$} (stemm);
  \draw[->] (stemm) to node [fill=white] {\footnotesize $ned$} (ndstemm);
  \draw[->] (stemm) to node [fill=white] {\footnotesize $n$} (nstemm);
\end{tikzpicture}

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