Above: Yellow Glacier Lily, or Trout Lily (Erythronium grandiflorum Pursh. ssp. grandiflorum) Family: Liliaceae  In the Midwest we have the trout lily but there is little documentation as to its edibility.  

Scroll to several other species below...

Native American Uses: Trout Lily bulbs Erythronium grandiflorum were cooked (steamed) before eating.  Some western tribes say the bulbs may cause vomiting.  Other tribes ate copious amounts of the bulbs.  Raw plant was eaten as a contraceptive. Bulbs were dried and stored for later use.  Medicinally crushed bulbs used over difficult wounds, boils  to aid healing.  (more)


Above:, Erythronium mesochoreum, the white Dog's 
Tooth Violet and edible root found on the banks of the 
Missouri river, also found in wet places in South and 
Southwest (Texas).

 

I found this species of Erythronium in the Pyrenees.  My Spanish field guide with over 300 photos of wild flowers did not identify this specimen.  (Spanish Medicine)
Erythronium montanum, Avalanche Lily in Spray Park on the northwest shoulder of Mt. Raineer.  Found in damp meadows 5000 feet.