In plant anatomy, the terms “primary” and “secondary” are very often used, becoming classics in morphological and anatomical literature. However, sometimes the terms can generate confusion, as there are no such categorical (firm) differences between a “primary” and a “secondary” structure, within the same plant organ (Table 1). In addition, to even complicate things, some authors also talk about a “tertiary” structure, as for example, in the case of vegetative organs that present the phenomenon of successive (additional) cambia (Grigore 2008; Grigore and Toma 2021a, b—and all references included and reviewed).