Allium triquetrum is the name of the flower or wild onion.
I am very fond of this wild flower which is actually more known as a weed. It grows in most the valley areas of northern California, and the name is Allium triquetrum or as I like to say, wild onion. A friend once told me this, and I always think of her when I see these pretty flowers, which I believe are edible onions too. But I would be careful where I get them from.