If this ID is correct (which I think it is...), the long bracts* (obvious in the photo) distinguish it from the similar Scilla peruviana (there are also leaf differences); see both here: http://www.pacificbulbsociety....
The Pacific Bulb Society link I added lists the ways in which Scilla hughii is distinguished from Scilla peruviana; just scroll to each of the two entries at the link. The most obvious way (and the one visible in the photo in question) is the prominent bracts.