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Erythronium americanum (Trout Lily)
http://ncnatural.com/wildflwr/troutlily.html
Image plus brief description.
Erythronium grandiflorum
http://www.botany.hawaii.edu/faculty/carr/images/ery_gra.jpg
image
Erythronium sibiricum
http://www.funet.fi/pub/sci/bio/life/plants/magnoliophyta/magnoliophytina/liliopsida/liliaceae/eryth
image