Apetalous is a botanical term that refers to plants that lack or have simple petals. Other synonyms for apetalous include petaloid, petalless, and apetalous. Some plants may have reduced or modified petals that can also be described as apetalous. In these cases, terms such as sepaloid or tepaloid can be used to describe the modified structures. Additionally, some plants may have flowers without sepals or petals and are called naked flowers, like in the case of Euphorbia oblongata. Hence, apetalous is an essential term in plant morphology that helps botanists and plant enthusiasts alike to describe the various structures and characteristics of plants.