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The SRGC Forum is probably one of the best Crocus reference sites in English...
I am besotted with Crocus -
You're not alone Maggi !!
Most likely random seedlings, I think. All lovely. See Thomas Huber's compilation of cultivar pictures to have a look: http://www.srgc.net/forum/index.php?topic=5060.0
Here in flower today,Crocus sieberi atticus 'Mt.Vardousia'
I was given one corm of Crocus corsicus by a Polish forumist. Normally 1/2 flowers per corm, so this is a special plant.