'chlamydeous' originates from Greek, specifically the word 'chlamys,' where 'chlamys' meant 'cloak' or 'mantle.'

'chlamys' transformed into the Latin word 'chlamydeus,' and eventually became the modern English word 'chlamydeous.'

Initially, it meant 'having a cloak or covering,' but over time it evolved into its current meaning of 'having a floral envelope or perianth.'