What is "fastigiate"

Fastigiate \Fas*tig"i*ate\, Fastigiated \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. (Zo["o]l.) United into a conical bundle, or into a bundle with an enlarged head, like a sheaf of wheat.

a. 1 (context botany English) Erect and parallel 2 (context botany gardening English) Having closely-bunched erect parallel branches 3 (context palynology English) Characterized by a fastigium, a cavity separating the intexine from the sexine near the endoaperture of a colporate pollen grain. 4 (context obsolete English) Tapering to a point n. (context gardening English) A tree or shrub with erect, parallel branches.

adj. having clusters of erect branches (often appearing to form a single column)