You can’t presently label those with annotations, so probably leave it blank. See previous discussions:
https://forum.inaturalist.org/t/bisexuality-in-flowering-plants/7042
https://forum.inaturalist.org/t/lets-talk-annotations/627
(the second one is very long - search for “bisexual” or “hermaphrodite” to find those discussions).
There is, however, an observation field named “PlantSex” that allows female, male, or monoecious as values. If you are doing a special study, you could add that field to any observations you are looking at.
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