Pretty spectacular, this species. I'm a big fan of a muted pallet of earth tones so this bloom is up there as one of my favorites. Fritillaria affinis (chocolate lily) flowers in midspring and is common in moist meadows and forests and in coastal herbaceous communities. In the Lilaceae (Lily) family. The scent of this inflorescence is subtle but potent and not for the faint-of-heart - a fetid rank scent that attracts fly and insect pollinators. Treated as F. lanceolata in Hitchcock. 
There are three other native Fritillaria and all are easy to tell apart. One is an east side species: F. pudica(yellow bells) with yellow flowers in early spring. F. atropurpurea (spotted mountain bells) occurs in east-side forests, alpine and subalpine communities and has blooms that are similar in color as the chocolate lily but tepals are noticeably shorter, leaves are also thinner. F. camschatcensis (Kamchatka fritillary) occurs from King County north in coastal communities and has maroon-colored blooms with parallel ridges on the inside of the petals (Turner & Gustafson). Fritillary flowers are generally nodding, often mottled, gland-bearing near the base, and have six stamens that are shorter than the tepals (Hitchcock).
