Tecophilea cyanocrocus  - one of the world's most stunning dwarf bulbs, famed for it's incredible gentian blue flowers. Also known as the Chilean Blue Crocus, it was thought to possibly be extinct, but has been recently rediscovered in the wild. Whatever its status in the wild it is relatively common in cultivation, but usually quite expensive. I grow it in a gritty compost, never allow it to dry out completely, repot every year and feed it (it is suggested by some writers that you should put a slab of llama dung in the bottom of the pot!) I understand some lucky people can grow it outside in Ireland, so people in frost free climes might consider trying it in their gardens or perhaps a trough.

If you look at an old gardening book you will see three forms described, the type all blue form, the lovely var leichtlinii (paler blue with a large white eye) and var violacea (deep violet blue). When the forms are grown together and seed is set, intermediate forms appear. I have had seed set a number of times, but unfortunately no luck with germination. However all forms reliably increase by producing small bulbs which flower within a few years.  
 

Re its rediscovery, I found a web page describing this, it is not in English but  you will still see the pictures of it in the wild. Interestingly these plants seem to be what we would call "var leichtlinii". Tecophilea in the wild

Please click on the thumbnails for the full sized pictures.