Wikipedia:

Calochortus | Mariposas | Mariposa lilies | Globe lilies | Fairy lanterns | Cat's ears | Star tulips

Summary:

a genus of bulbous plants that includes 70 species from British Columbia to Guatemala and east to Nebraska. Calochortus is the most widely dispersed genus of Liliaceae on the North American Pacific coast. Of these, 28 species are endemic to ...  (40 of 951 words, 9 images, pronunciation)

Link:

http://en.wikipedia.org/wiki/Calochortus  [cite]

Britannica:

mariposa lily | Calochortus [genus]

Summary:

tuliplike perennial plants of the lily family, consisting of about 40 species native to western North America. They have simple or somewhat branched ...  (23 of 102 words)

Link:

http://www.britannica.com/EBchecked/topic/365457/mariposa-lily  [cite]