Unless you know exactly what SEX characteristics the plant may have, then it is best to leave the SEX set to [Unspecified].

The SEX characteristic is mainly an informational parameter rather than one on which to base a search.

Alternatively, if you really would like to know which plants are, for instance, 'Dioecious', then click on sex?dioecious and a list will be produced of those flowers having that property which are featured in this tomb so far.

WildFlowerFinder Homepage