Viola purpurea integrifolia (Smooth leaved violet)

Viola purpurea is a species of violet which bears yellow flowers. It is known commonly as the goosefoot violet. It is a small plant which bears thick to fleshy toothed or ridged oval leaves which are mostly green but may have a purplish tint to them. The flowers are made up of bright yellow petals, the lowermost being streaked or veined with purple and the lateral petals with purplish undersides.

— Wikipedia