There are various reasons given for the widespread Ashkenazi custom to be stringent in not eating kitniyot on Pesach. Among them: kitniyot look similar to chametz and may be confused; kitniyot is often collected in to the same storehouses as chametz, kitniyot is often made into similar products as chametz, etc.
I was walking in the Israeli outdoors on chol ha'moed Pesach and, at present, there is wild mustard growing everywhere. On a regular day I would often pick some, taste it, teach the kids, etc. But mustard is generally considered to be kitniyot. Is there any reason to be machmir and not eat this mustard, given that (I imagine) the reasons not to eat kitniyot dont apply here, since I can see the actual plant and it is going from the plant straight into the mouth without any chametz in sight. Or is there a "lo plug", and it would be forbidden in any case.
Stated otherwise: If the conditions for kitniyot clearly do not apply and can be verified as such i.e. my immediate personal experience standing in front of a wild mustard plant, is kitniyot still prohibited for this situation?