The blue/purple Camas (Common) is edible. The white one will kill you if you eat the bulb (and perhaps other parts). Once the flowers die off, it's pretty much impossible to tell them apart.

Camera:	Nikon D2x
Date:	Saturday, May 19th, 2007 at 4:35 PM
Exposure:	1/80 sec at f9.0
ISO:	100 asa
Lens:	12-24mm f4G ED DX AF-S Zoom-Nikkor at 12mm (equivalent field of view of a 18mm lens on a 35mm camera)
Photographer:	John Harvey
Scientific Name:	species related to Camassia quamash (common camas) species related to Zigadenus venenosus (death camas (Zygadenus venenosus))
Tag:	beach, flowers
Larger Image:	1328 x 1999
Raw Image:	2848 x 4288