Palmae

...In Japan, coconut palms (illustration) were traditionally simply called "yashi," but in recent years, palms (illustration) have been used collectively to refer to all plants in the palm family.
[Palmae (palm family)]
Palms, which are unique among woody monocotyledonous plants along with the bamboos of the grass family, almost always have trunks that do not branch or undergo secondary thickening, and they have large leaves clustered at the top of the trunk, characterizing the tropical landscape. They take on the so-called palm-shaped life form. …

*Some of the terminology that mentions "Palmae" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…日本では従来，ココヤシ（イラスト）を単にヤシと呼んでいたが，近年ではヤシ科の植物を総称してヤシ（イラスト）という。
【ヤシ科Palmae(palm family)】
　木本性の単子葉植物として，イネ科のタケ類とともに特異的な存在であるヤシ科の植物は，ほとんどの場合，幹は分枝せず二次肥大生長もしないうえに，大きな葉を幹の頂端部に群がりつけ，熱帯の景観を特徴づける。いわゆるヤシ形の生活形になる。…

※「Palmae」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報