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Key A: Desmodium with very narrow leaflets
| 1 Petioles (0-) 1-3 (-4) mm long, the leaves thus subsessile; leaflets 5-10 mm wide, strongly pubescent on the lower surface |
| 1 Petioles 3-15 mm long, the leaves thus obviously petiolate; leaflets 2-5 (-8) mm wide, glabrate or inconspicuously puberulent on the lower surface. |
..2 Loment segments flat to distinctly concave along the upper (suture) margin; [of dry to mesic habitats] |
| ..2 Loment segments slightly convex along the upper (suture) margin; [of boggy, wet, or mesic habitats] |