Oxalis trilliifolia Hook.

Idaho: Boundary County: [locality and coordinates withheld; status in Idaho: S1 (Critically Imperiled; IDNHP)],
Riparian area in a Tsuga heterophylla climax forest, site is early seral, burned fairly completely in 1967; along streamlets but also on main stream; most consistent associate is Athyrium filix-femina and best stands are beneath Alnus sinuata, other common associates are Senecio triangularis, Viola glabella, Salix scouleriana, Gymnocarpium dryopteris and Mitella caulescens. Specimen growing in mass mats immediately along side of streamlets, but also patchy in low spots on the main stream. Early flower stalks have 3 or more flowers. Tips of petals on most advanced flower buds are white. Phenology: Flowers.

P. D. Johnson s.n., Jun 9, 1982
With F.D. Johnson
ID, Accession: 93559, Barcode: ID078547