I want to have the following trees aligned to the baseline. There is a problem which is probably due to the "g" in some of the trees. How do I get these trees aligned? I tried \strut, but this somehow did not work.
\documentclass{article}
\usepackage{tikz-qtree}
\tikzset{every roof node/.append style={inner sep=0.1pt,text height=2ex,text depth=0.3ex}}
\begin{document}
\begin{figure}[htbp]
\begin{tikzpicture}
\tikzset{level 1+/.style={level distance=2\baselineskip}}
\Tree[.NP
[.Det die ]
[.N Frauen ] ]
\end{tikzpicture}
\begin{tikzpicture}
\tikzset{level 1+/.style={level distance=2\baselineskip}}
\tikzset{frontier/.style={distance from root=6\baselineskip}}
\Tree[.NP
[.Det die ]
[.N
[.Adj klugen ]
[.N Frauen ] ] ]
\end{tikzpicture}
\begin{tikzpicture}
\tikzset{level 1+/.style={level distance=2\baselineskip}}
\tikzset{frontier/.style={distance from root=6\baselineskip}}
\Tree[.NP
[.Det die ]
[.N
[.Adj klugen ] ] ]
\end{tikzpicture}
\begin{tikzpicture}
\tikzset{level 1+/.style={level distance=2\baselineskip}}
\tikzset{frontier/.style={distance from root=6\baselineskip}}
\Tree[.NP
[.N
[.Adj kluge ]
[.N Frauen ] ] ]
\end{tikzpicture}
\caption{\label{abb-np2}Verschiedene Nominalstrukturen ohne leere Elemente}
\end{figure}
\end{document}

\raisebox{0pt}[\height][0pt]{...}aroundklugenandkluge. See http://tex.stackexchange.com/questions/21608/center-text-in-tikz-according-to-the-text-baseline-not-the-object-itself. – Jeroen Zuiddam Mar 01 '14 at 12:50