Adjective
Indicates the quality of being a command, or being related to the command.
(grammar, not comparable) Noting the imperative use of the subjunctive, as in "I insist that he leave immediately".
the mandative subjunctive
However, the mandative subjunctive has always been used in BrE. Source: Internet
The mandative subjunctive (as in "the City Attorney suggested that the case not be closed") is livelier in American English than it is in British English. Source: Internet