a. Bot. [mod. f. Gr. ἀ priv. + χλαμύδ-α cloak + -EOUS.] Having no floral envelope; destitute of apparent calyx and corolla. Applied to a division of Exogens, named by De Candolle Achlamydeæ.
1830. Lindley, Nat. Syst. Bot., Introd. 24. Its absence [that of the Calyx] implies the absence of the corolla also … By its absence all the orders called Achlamydeous are characterised.
1876. Oliver, Elem. Bot., 40. Having therefore no envelope to the essential organs, they [the willow flowers] are called achlamydeous.
