I found a key to
Sternbergia at
http://citesbulbs.myspecies.info/ which I found very interesting, lots of information here, although I have not found out how to use all of it yet. It seems as if there are only 7 recognised species today, thus I found the answer to my question in the first post I had on
Sternbergia (are the ones in my area in Halkidiki
S. lutea or
S. siccula?) in the introduction:
Although most
Sternbergia species can be differentiated by discrete taxonomic characters,
S. lutea (L.) Ker Gawl. ex Spreng and allies
S. siculaTineo ex Guss. and
S.greuteriana Kamari & R.Artelari, have been shown to be an exception (Gage & Wilkin, 2008). A recent morphometric study by Gage & Wilkin (2008) has shown that "as a result of the continuous variation shown in leaf width, tube length and perianth segment size and shape, it is not possible to differentiate the three existing species from each other".Therefore, it was suggested that the three taxa above should be regarded as a single species,
S. lutea.
So Alisdair's conclusion earlier was confirmed.