\Mon`o*sep"al*ous\, a. [Mono- + sepal: cf. F.
monos['e]pale.] (Bot.)
Having only one sepal, or the calyx in one piece or composed
of the sepals united into one piece; gamosepalous.

Note: The most recent writers restrict this term to flowers
      having a solarity sepal, and use gamosepalous for a
      calyx formed by several sepals combined into one piece.
      Cf. {Monopetalous}.