\begin{tikzpicture}[>=stealth', line width=.15em]
  \node (stem) at (-10,0) {$x\leq \textsf{m-affixed}$};
  \node (ndstem) at (-15,-6) {\sf nposs};
  \node (nstem) at (-5,-6) {\sf nposs};

  \draw[->] (stem.south) to node [fill=white] {\footnotesize $q$} (ndstem);
  \draw[->] (stem.south) to node [fill=white] {\footnotesize $r$} (nstem);
\end{tikzpicture}

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