# Two lines in a single node in Forest

I have recently switched from the tikz_qtree package to forest. Now I'm trying to change my trees to fit the forest coding. However, I can't find the way to let a single node contain two lines. I do not want the I-node in my example to branch to are. In the tikz-qtree package this could be done with the command:

\tikzset{every tree node/.style={align=center,anchor=north}}

\documentclass[12pt]{article}
\usepackage[utf8x]{inputenc}
\usepackage{forest}
\usepackage{ucs}
\usepackage{geometry}                % See geometry.pdf to learn the layout options. There are lots.
\geometry{a4paper}
\usepackage{gb4e}
\usepackage{flexisym}

\begin{document}

\begin{exe}
\ex
\begin{forest}, baseline
[IP,
[Spec]
[I\textprime,
[I \\ are]
[VP]
]]
\end{forest}
\end{exe}

\end{document}


To do this in forest you also need to tell it to align node text as center. I've added a qtree style which does this for every node and also makes the branches join unlike the default forest style, which is IMO somewhat ugly.

\documentclass[12pt]{article}
\usepackage{forest}
\forestset{qtree/.style={for tree={parent anchor=south,
child anchor=north,align=center,inner sep=0pt}}}
\usepackage{flexisym}

\begin{document}

\begin{forest}, baseline, qtree
[IP
[Spec]
[I\textprime,
[I\\are]
[VP]
]]
\end{forest}

\end{document}


• What do you mean by 'must be bracketed'? You don't need the curly brackets around the multiline node, by the way. – cfr Apr 16 '15 at 2:55
• Yes you're right. And the extra code in my tree was just a leftover. So now my answer looks like yours. – Alan Munn Apr 16 '15 at 22:16
• I've changed my answer so it just makes the point about adding baseline to the style. I did delete it completely but then thought that bit might be useful. I'll delete if you prefer, though. – cfr Apr 16 '15 at 22:35
• It doesn't matter to me. I was too busy at the time of your original comment to respond otherwise I would have corrected this sooner. – Alan Munn Apr 17 '15 at 3:28

This is a small supplement to Alan Munn's solution. If all of your trees styled with qtree should be aligned with baseline, you can add this to the qtree style also:

\documentclass[tikz,border=10pt]{standalone}
\usepackage{forest}
\forestset{
qtree/.style={
baseline,
for tree={
parent anchor=south,
child anchor=north,
align=center,
inner sep=1pt,
}}}
\usepackage{flexisym}

\begin{document}

\begin{forest}
qtree,
[IP
[Spec]
[I\textprime,
[I\\are]
[VP]
]
]
\end{forest}

\end{document}