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\psset{arrows=->,framearc=.2} \def\Treebox#1{% \Tr{\psframebox{#1}} } \pstree[treemode=R] {\Treebox{A$\rightarrow$B}}{ \pstree{ \Treebox{B$\rightarrow$C} }{ \Treebox{A$\rightarrow$D} \pstree[treemode=L] {\Treebox{B$\rightarrow$E}} {\Tn\TC[arrows=<-]} } }