vkingdom Plantae - plants » divisio Magnoliophyta - flowering plants » class Rosopsida - eudicots » order Malpighiales » family Violaceae » tribus Violeae > genus Viola > Viola sect. Chamaemelanium Ging. > Viola subsect. Nuttallianae M. Baker
Distributional Range: Native Northern America SOUTHWESTERN U.S.A.: United States [California]
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Distribution: Viola tomentosa occurs in El Dorado, Nevada, Placer, Plumas, and Sierra counties (north-central High Sierra Nevada ).
Ecology: Dry, gravelly places, open ponderosa, Jeffrey, lodgepole pine forests; 1500–2000 m; Calif.
M. S. Baker (1949) reported that nearly every leaf axil of V. tomentosa produces a flower bud and that these buds produce chasmogamous flowers late in season instead of cleistogamous flowers, as do other members of the V. nuttallii complex.
Viola tomentosa hybridizes with V. purpurea; the hybrids appeared sterile (M. S. Baker 1949). J. Clausen (1964) reported a putative hybrid between V. tomentosa and V. sheltonii from one location in Sierra County.
References:
Fabijan, D. M. et al. 1987. The taxonomy of the Viola nuttallii complex. Canad. J. Bot. 65:2575.
Hickman, J. C., ed. 1993. The Jepson manual: higher plants of California