I am having some confusion on a Callistemon with the name 'Little John'. I have record of it being Callistemon citrinus 'Little John', but in our database is is named Callistemon viminalis 'Little John'.

Little John is a dwarf shrub.

C. citrinus grows from 3 to 9 feet
C. viminalis grows 26 feet

Could the entry in our database be incorrect as to Little John being viminalis?

I think you should change it to citrinus. That might be one of the errors that came over from DG.

Thank you Zuzu. I have some photo to add also.