Steer's Head = Dicentra uniflora
--Karl Holte
Long-horn Steer's Head, or One-Flowered Steer's Head, Dicentra uniflora. Found at our area's higher elevations (5,000'+) very soon after snowmelt.

This website-- http://www.fs.fed.us/
ipnf/eco/yourforest/
poisonousplants/
steershead.html
--had the following information:

Related to the gardener's bleeding hearts, steer's head grows in rich, well drained, organic soils throughout the northwest. Death in humans is rare but symptoms may include vomiting, diarrhea, severe trembling, and difficulty in breathing. Children are at greater risk than adults.
--Ruth Moorhead