Viola renifolia
 
Kidney-Leaved Violet

Flower Top

Fir River Shelter on Fir River Road, West of Hudson Bay
20-May-2016

Note the lateral petals are beardless.

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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Renifolia: Answers to questions in Lee/Harmes key leading to this species. 
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NOT [plants large 20 to 60 cm in height]

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flowering stems without leaves

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leaves greater than 2.5 cm wide and long

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undersides of leaves with a few hairs; NOT [underside of leaves hairless]

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scapes not noticeably elongate

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lateral petals beardless; NOT [Lateral petals with an inconspicuous tuft of hairs], NOT [Lateral petals bearded]

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flowers white; NOT  [flowers purple-blue, mauve, or 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]