A tree or shrub with erect, parallel branches.
Erect and parallel
The branches of this species are fastigiate.
Having closely-bunched erect parallel branches
This is a fastigiate variety.
Characterized by a fastigium, a cavity separating the intexine from the sexine near the endoaperture of a colporate pollen grain.
The grains are 3-colporate and fastigiate.
Tapering to a point