Basically, if there is claimed that for instance XY plant family has woody plants in it, it does not mean that whole plant family is woody.
Means some species in it are certainly and the other might not be woody inside that family.
So you end up selecting a lot of properties hoping that you will get very limited if not (hardly) single family as result.
Practicaly useless by my opinion. But I have seen some data potential there:
here 1 directly negates 2 and vice versa , so if one family is marked as punched in 1 and not punched in 2 ... That should mean that whole family 1 contains no herbaceous species . All species inside family 1 are woody. Read last paragraph a couple of times (-:1. Woody plants (excl. suffrutices)
2. Herbaceous plants (incl. suffrutices)
There are cases where multiple properties negates single property .... Prepared a few examples.
http://agrozoo.net/test/test20.html In resulting families all species have that property.
Certatin buttons does not produce anything. That is logically OK.
Comments, bug reports (I should think none as I tested it a lot) ...