The word 'whorled' is built upon the noun 'whorl,' which itself evolved from a variant of the Middle English word 'whirl,' denoting a rapid circular motion. This connection to circularity is key, as 'whirl' can be traced back to Old Norse hvirfill, meaning "circle, ring, crown," and further to the Proto-Germanic root hwirbilaz, from the verb hwirbaną meaning "to turn." The suffix '-ed' is a productive adjectival ending in English, inherited from its Germanic ancestry, used to indicate possession of a quality. Thus, the literal construction "having whorls" directly and logically describes the characteristic botanical or structural pattern of parts arranged in concentric circles or spirals around a stem.

Structure: whorl + ed - whorl: From Middle English whorle, wharle, a variant of whirl. It functions as the base noun meaning a circle of leaves or petals, or a spiral. - ed: A suffix of Germanic origin (Old English -ed, -od, -ad) used to form adjectives from nouns, meaning "having, provided with, characterized by."