形容詞 fastigiate:

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

fas.tig.i.ate

adj.Botany （形容詞）【植物學】
Having erect and almost parallel branches tapering toward the top, as in the Lombardy poplar.
帚狀的：倫巴第白楊樹等的枝條挺直，幾乎平行，且向頂端逐漸變細的

來源：
Medieval Latin fastogi3tus [high]
中世紀拉丁語 fastogi3tus [高的]
from Latin fastogium [apex, height]
源自 拉丁語 fastogium [尖頂，極度]

【引伸】
fastig.iately
adv.（副詞）