fas·ti·gi·ate /fæˈstɪʤiət/
  (a.)錐形的,傾斜的
  Fas·tig·i·ate Fas·tig·i·a·ted a.
  1. Narrowing towards the top.
  2. Bot. Clustered, parallel, and upright, as the branches of the Lombardy poplar; pointed.
  3. Zool. United into a conical bundle, or into a bundle with an enlarged head, like a sheaf of wheat.
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  fastigiate
       adj : having clusters of erect branches (often appearing to form a
             single column)