Lin, It would mean editing what I have as well but I think it would be worth the effort.
Some of the sites don't give differing degrees of salt tolerance so here's another possibility. We post our lists using;
Salt Tolerant
Moderately Salt Tolerant
Slightly Salt Tolerant
Maybe not including plants which are salt sensitive.
Add a fourth category
Unknown salt tolerance
Dave adds these to the DB leaving
Unknown salt tolerance out. We can then run through this list and handle them singly or we could ask Dave to run a report
which eliminates entries which made it into the DB.