I assume you mean "scarified"? Generally, it is the larger, exceptionally hard-shelled seeds. But the list is easily hundreds of varieties and far too long to type it all out for you. What specifically are you interested in knowing about?

Better yet just go to one of the many germination databases and you can look up each plant variety to find out if it needs scarification or not.

Dave

Here is a link that might be useful: Seed germination databases

Dave

"Scarified" that is exactly what I meant, I was looking for plants like melons, passifloras