Sororia: Answers to questions in Lee/Harmes key leading to this species. 

	Flowers purple-blue or mauve; NOT [Flowers yellow]; NOT [Flowers white]
	Leaves not deeply divided or lobed, merely shallowly toothed; NOT [Leaves cleft almost to their bases]
	Plant without a leafy flowering stem, the leaves and flower stem all grow from a central rootstalk; NOT [Plant has leafy flowering stems]
	Petals beardless, flower spur is long, about 2/3 the length of the petal blade; NOT [Side petals or all petals bearded]
	Some leaves with hairy petioles; NOT [Plants glabrous]

Violaceae: Answers to key questions in Budd's Flora leading to this family. 

	herbs; NOT [shrubs or trees]
	plants terrestrial or semiaquatic; NOT [plants aquatic, leaves submerged or floating]
	plants not with colored milky juice
	plants with more than one normal leaf
	some or all leaves alternate; NOT [leaves opposite, whorled, or basal]
	leaves with stipules; NOT [leaves without stipules, or having glands]
	flowers with two floral rings
	calyx regular; NOT [calyx irregular, some sepals smaller than others]
	corolla with each petal distinct from the others
	corolla irregular in shape; NOT [corolla regular in shape]
	corolla with one petal spurred or sac-like; NOT [corolla pea-like]
	stamens usually separate or partly so, not in a column; NOT [stamens numerous, united into a column]
	fruit a 3-valved capsule; NOT [fruit a legume]