Monochlamydeous adj. (Bot.) Having a single floral envelope, that is, a calyx without a corolla, or, possibly, in rare cases, a corolla without a calyx.
... seems seldom or ever to occur; the nearest approach to it would be in those cases where the calyx is, as it is termed, "obsolete," but here it is chiefly the limb of the calyx which is atrophied, the lower portion being more or less adherent to the ovary. In what are termed monochlamydeous flowers both calyx and corolla are wanting, as in Salicineae and ... — Vegetable Teratology - An Account of the Principal Deviations from the Usual Construction of Plants • Maxwell T. Masters
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