Viola pubescens
 
Downy Yellow Violet

Lower Petal Bottom

Junction of # 980 and # 981, East of Hudson Bay
17-June-2014

Note that all the other petals have been removed from this flower.

A key to violets originally written by Vern Harmes and subsequently expanded by Glen Lee to include most of the violets found in Saskatchewan can be found here. 

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Pubescens: Answers to key questions in Lee/Harmes key leading to this species. 
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plants 20 to 40 cm tall

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stems covered in downy hairs

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flowering stems leafy at the top

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leaves ovate with cordate bases

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flowers yellow

 

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Violaceae: Answers to key questions in Budd's Flora leading to this family. 
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herbs; NOT [shrubs or trees]

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plants terrestrial or semiaquatic; NOT [plants aquatic, leaves submerged or floating]

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plants not with colored milky juice

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plants with more than one normal leaf

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some or all leaves alternate; NOT [leaves opposite, whorled, or basal]

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leaves with stipules; NOT [leaves without stipules, or having glands]

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flowers with two floral rings

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calyx regular; NOT [calyx irregular, some sepals smaller than others]

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corolla with each petal distinct from the others

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corolla irregular in shape; NOT [corolla regular in shape]

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corolla with one petal spurred or sac-like; NOT [corolla pea-like]

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stamens usually separate or partly so, not in a column; NOT [stamens numerous, united into a column]

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fruit a 3-valved capsule; NOT [fruit a legume]