Hi BBM2, sorry for delaying proceedings. I'm afraid (much to aristo's, if not everyone else's chagrin, it's a "ghost" anagram with replacement and probably the parse isn't worth waiting for but thanks for asking before voting and giving me the opportunity.
Unusually flowering at night but not in Nova Scotia and Ohio state where it's indigenous
Definition: state where it's indigenous
Flowering at night = nyctanthous
Minus (but not in) ns (Nova Scotia) + (and) oh (Ohio)
Anagrind: Unusually
Cheers.