\documentclass[12pt]{standalone}
\input{header}
\usepackage[edges]{forest}
\usetikzlibrary{shadows.blur,arrows.meta}
\pagestyle{empty}
\def\name#1{\textsf{\it #1}}
\tikzset{concept/.style={rectangle split,rectangle split parts=1,draw,
    fill=white,blur shadow,rounded corners,align=center}}
\begin{document}
\begin{forest}
  [\name{AosBasicTraits\_2},name=abt,
    % forked edges,
    for tree={concept,edge={-latex}}
    [\name{AosApproximatePointTraits\_2}
      [,phantom]
      [\name{AosLandmarkTraits\_2},name=alt,before drawing tree={x=0}]
    ]
    [\name{AosConstructXMonotoneCurveTraits\_2},name=acxmt]
  ]
  \draw[-latex] (acxmt) to (alt);
\end{forest}
\end{document}
