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 sheltonii Torr. - Shelton's Violet 

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

Ecology —Red fir, yellow pine, mixed evergreen, chaparral, oak woodlands, rich or gravelly soil; 800–2500 m; Calif., Colo., Idaho, Oreg., Wash 

The cleistogamous flowers of Viola sheltonii are borne on long, prostrate peduncles usually buried in duff around the plant. Mature cleistogamous capsules are usually hidden and the dehisced seeds remain close to the parent plant. Some populations of V. sheltonii produce only cleistogamous flowers (D. Klaber 1976). 

References:

1. Hickman, J. C., ed. 1993. The Jepson manual: higher plants of California

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

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

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