In this example, using pst-tree
package:
\def\psedge{\ncangles[armA=.5, angleB=180, linearc=.2]}
\pstree[treemode=R, levelsep=3cm] {\Toval{ root }} {
\Toval{ Tom }
\Toval{ Cat }
\Toval{ Very very very very very long entry }
\Toval{ Jerry }
}
The output is ugly because the nodes are aligned by center, how can I make it align to the left?