名詞 caudex:

1. persistent thickened stem of a herbaceous perennial plant
   同義詞：stock
2. woody stem of palms and tree ferns

cau.dex

n.（名詞）
【復(fù)數(shù)】 cau.di.ces[-d-sôz.] 或 cau.dex.es
The thickened, usually underground base of the stem of many perennial herbaceous plants, from which new leaves and flowering stems arise.
莖基：多年生草本植物的，通常在地下的粗大莖基，從中生出新葉和花莖
The trunk of a palm or tree fern.
棕櫚樹或樹蕨的樹干

來源：
Latin caudex [tree trunk]
拉丁語 caudex [樹干]