\documentclass{article} \usepackage{tikz} \usetikzlibrary{arrows} \usetikzlibrary{calc} \usepackage{xifthen} \begin{document} \begin{tikzpicture}[>=latex', node distance=2cm] \node (X0) {$X_o$}; \pgfmathsetmacro{\N}{4} \foreach \x in {0,...,\N} { \pgfmathtruncatemacro{\nextval}{\x+1} \ifthenelse{\x = \N} {\def\speciesName{$X_1$}} {\def\speciesName{\large $x_\nextval$}} \node [right of = X\x] (X\nextval) {\speciesName}; \draw [->,ultra thick,blue] (X\x) -- node[above, black] {$v_{\nextval}$} (X\nextval); } \end{tikzpicture} \end{document}

Here are some examples for N = 0, N = 2 and N = 4

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