vkingdom Plantae - plants »  divisio Magnoliophyta - flowering plants »  class Rosopsida - eudicots » order Malpighiales »  family Violaceae »  tribus Violeae > genus Viola > Viola sect. Chamaemelanium Ging.  > subsect. Chrysanthae  W. Becker 

Viola trinervata (T.J. Howell) T.J. Howell ex Gray - Rainier Violet  

(synonyms: Viola beckwithii var. trinervata Howell)

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Distributional Range: Native Northern America NORTHWESTERN U.S.A.: United States [Oregon, Washington]

Ecology —Sagebrush flats, dry, rocky hillsides, usually in gravelly soil; 400–1200 m; Oreg., Wash.

In some populations of Viola trinervata the lower three petals are white with a yellow area proximally (V. B. Baird 1942).

References:

1. Hitchcock, C. L. et al. 1955-1969. Vascular plants of the Pacific Northwest.

2. Huxley, A., ed. 1992. The new Royal Horticultural Society dictionary of gardening

3. Liberty Hyde Bailey Hortorium. 1976. Hortus third.