Monosepalous
Monosepalous , adjective
[Mono- + sepal: compare French monosépale.]
(Botany) Having only one sepal, or the calyx in one piece or composed of the sepals united into one piece; gamosepalous.
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. Compare Monopetalous.