Here at Wisley the RHS did a trial of "little blue bulbs" which ran from 2000 to 2003 and included about 80 species and cultivars from 8 genera, including Chionodoxa. One of the aims of the trial was to clarify the confused taxonomy of this group of bulbs. The results of the trial were published in a colour bulletin written by Brian Mathew and Melanie Dashwood. The bulletin can either be purchased for a modest fee or viewed for free on the RHS website at: http://rhs.org.uk/learning/publications/… (Scroll down to find the relevant bulletin, entitled "Hyacinthaceae - little blue bulbs") Hopefully this will help with the identifications. I think the original picture Arnold posted a question about is probably C. sardensis Paul Cumbleton RHS Wisley, UK Zone 8