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1 Petals deeply to shallowly emarginate (notched at the tip), yellow, white, or lavender, 7-15 mm long; leaf lobes entire to shallowly dentate, the terminal lobe markedly larger than the largest lateral lobes.
2 Siliques conspicuously torulose (constricted between the seeds), even when young; seed wings absent or < 0.1 mm wide
2 Siliques not torulose (constricted between the seeds) (or slightly so in L. stylosa); seed wings 0.2-0.5 mm wide.
3 Petals 7-10 mm long, shallowly emarginate; styles 0.7-3 mm long; siliques flattened in the plane of the replum; [AL, GA, KY, OK, TN, or TX].
4 Fruits margined; styles (1.5-) 2-3 mm long; [OK and TX].
5 Leaf blade terminal lobes equal to or slightly longer than wide, margins usually shallowly dentate; petals pale yellow, obcordate to broadly obovate; [OK (Choctaw and McCurtain counties)]
3 Petals 10-16 mm long, deeply emarginate; styles 2.5-7 mm long; siliques thick (terete or subterete) or flattened in the plane of the replum; [AL and TN].
8 Siliques thin, flat; styles 1.5-5.5 mm long; petals white to lavender; [n. AL].
9 Styles 2-5.5 mm long; mature siliques cuneate at the base and acute at the tip; [AL (Colbert, Franklin, and Lawrence counties)]
8 Siliques thick, fleshy; styles 2.5-7 mm long; petals yellow, white, or lavender; [n. AL and c. TN].
10 Siliques 12-15 mm long, 3-4 mm wide; seeds slightly elongate, cleft at one side of the long axis; [TN (Sumner, Smith, Wilson, Davidson, Rutherford, Bedford, and Maury counties)]