There-in lies the problem! Many people are not trained botanists/taxonomists/horticulturists so they may not notice subtle differences between the parent plant and the seedlings. In my opinion this should not be how it works, but I understand the need for such a distinction. The agricultural industry as a whole grows many plants that are not very good for propagation through cuttings and growing from seed is much more effective. For instance, apples do not come true from seed. However, if I went to the grocery store and bought some 'Granny Smith' apples and planted the seeds and the resulting trees produced sour, cardboard textured, green skinned apples that are approximately the same size as those in the store I could call my apples 'Granny Smith' apples. However, maybe the fruit on my tree are a little larger and less cardboardy textured than those of the original Granny Smith trees which are propagated through grafting. Are they still 'Granny Smith' apples?
Technically no they are not because they are not in appearance identical and the taste is different. However, it would take an expert on Granny Smith apples to determine this. Trust me I know a couple people that could determine the difference
. But if it were some random schmuck that just decided that he wanted to grow his own apples from the grocery store he may just call them Granny Smiths and leave it at that.
Anyway, the whole idea of a "clone" referring to a named entity is rather confusing which is why I try to avoid the term entirely except when referring to cloning a plant via division, asexual propagation, or tissue culture. It is only a clone if it came asexually from the original cultivar. I.E. a division from
Cephalotus follicularis 'Eden Black'
If you are growing from seed that has been selfed, or hybrid seed you can and SHOULD label it this way.
Cephalotus follicularis EX. 'Eden Black' x 'Hummers Giant' for example. If it is selfed seed you should label it
Cephalotus follicularis this little circle with an "X" through it 'Eden Black'
Even if your seedlings appear identical in traits to 'Eden Black' I urge you to call it with the above labels to avoid perpetuating the idea that your seed is genetically identical to 'Eden Black' which is unfortunately what most people think a cultivar is. Even though you are technically well within your rights to call your seedlings Cephalotus follicularis 'Eden Black' if the traits appear to be identical to the original cultivar description.