You are a good researcher. I have encountered the same thing with these types, and find that there doesn't seem to be a seed company selling Sydney as a pure strain.
Thompson and Morgan sell a "LIGHT BLUE STAR" that looks like yours.
Beware, that to avoid copyright infringement, some people out there will give these strains, new personal on Ebay names, which adds confusion to the consumer end.
Blue Denim, Blue Star, Light Blue Star, Sydney, etc. Are they all the same thing, with the pictures taken at different times of day??? Maybe.
As for the seed color, my opinion is this. I personally believe, the longer a seed pod has to ripen the darker it gets. I believe that if a variety is allowed all the time it wants, in the climate it chooses, the seeds will be more uniform in color. I believe that if I grow a strain, that folks to the south of me grow prolifically, that I will probably have a higher count of light seeds. I think that the light seed coats occur for at least 2 reasons. In Japan they have a practice of removing the outer seed coat, thus softening it an making it grow for the buyer more easily.
The other way I think seeds come in various shades is this. If I plant a seed of a morning glory, and allow it to grow up a stick, and bloom it's heart out, that come frost, seed ripening stops. So I start at the bottom of the vine and work my way up to the top. At first all the pods contain black seeds, but this changes little by little until I get to the top of the vine, where some of the pods, don't even get compared to the others, because they were so new when the freeze came. The last ones at the top turn to mush. They must be included in the count of the ones that didn't turn black before they are thrown away.
I have repeatedly said "I", because many sweet people here on this forum believe the color of the seed coat of seeds of the same plant have some,
as yet unknown meaning, yet to be discovered. Maybe they want to psych out some of the genetics, prior to growing it out? Therefore, I think it is best to use the lightest colored seed coats first because they probably have the shortest shelf life.
Remember this. If you take a picture of the same flower at hourly intervals, by the end of the same day, , the time of day the picture was taken, is very important in identifying that variety by a mugshot of the flower. 5am and 11am pictures could be so different, , in color, that they might be mistaken to be different varieties, even though THEY ARE PICTURES OF THE SAME FLOWER HOURS APART.
Hope some of this helps. Frank
