Sentence:  It was first described and figured in 1797, by Cavanilles, who called it <WSD>Cosmos</WSD>, from the Greek word Kosmos, beautiful ; but this name was afterwards altered by Willdenow to Cosmea, as being more consistent with the rules of botanical nomenclature. 
Meaning of the word marked with <WSD> tags:  Any of various mostly Mexican herbs of the genus "Cosmos" having radiate heads of variously coloured flowers and pinnate leaves.