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Key to Desmanthus

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1 Shrub or suffrutescent herb (woody below), erect, single-stemmed or branched from the base; legumes 46-100 mm long, straight or nearly so; [of FL or TX].
..2 Pinnae pairs 6-14 (-17) per leaf; new growth terminal on existing branches; [of s. TX]
..2 Pinnae pairs 4-8 per leaf; new growth basal from the woody taproot; [of s. FL]
1 Perennial herbs, prostrate, decumbent, ascending, or erect, with numerous stems from the base; legumes 15-82 mm long, straight to strongly falcate; [collectively widespread].
....3 Leaflets with raised reticulate venation on the lower surface; [of TX].
......4 Fruiting peduncles 2-6.2 cm long; fruits dark brown at maturity with only slightly raised reticulate venation on the valves, apically obtuse; leaflets abaxially pubescent; sterile flowers present at the base of the inflorescence
......4 Fruiting peduncles 7-14 cm long; fruits light brown at maturity with conspicuous raised reticulate venation on the valves, apically acute; leaflets abaxially glabrous or glaucous; sterile flowers absent
....3 Leaflets with venation obscure on the lower surface, except the midvein; [collectively widespread].
........5 Young stems velutinous with spreading white hairs of variable lengths, on the ridges and between them (though less densely than on the ridges)
........5 Young stems glabrous to sparsely pubescent, only on the ridges of the stem.
..........6 Pinna pairs (5-) 7-18 per leaf; stamens 5; legume 15-25 (-32) mm long, 4.5-7.0 mm wide, 3-4× as long as wide, strongly curved; [widespread]
..........6 Pinna pairs 1-7 (-9) per leaf; stamens 5 or 10; legume 22-82 mm long, 2.5-4.5 mm wide, 8-25× as long as wide, straight to slightly curved.
............ 7 Pinna pairs 4-7 (-9) per leaf; stamens 5; legume 40-74 mm long, 2.5-3.0 mm wide, > 18× as long as wide
............ 7 Pinna pairs 1-5 per leaf; stamens 10; legume 27-82 mm long, 2.5-4.5 mm wide, 8-20× as long as wide.
............ ..8 Nectary between lowest pair of pinnae 0.3-1.0 (-1.2) mm in diameter; legumes dehiscent along both sutures but not curling longitudinally and the inner surface of each valve therefore remaining concave; taproot brown, cylindrical (to 50 cm long × 2 cm in diameter)
............ ..8 Nectary between lowest pair of pinnae 0.8-3.0 mm in diameter; legumes dehiscent along both sutures, the sutural ridges curling longitudinally over the valves after dehiscence and causing the inner surface of each valve to be slightly convex; taproot red, napiform (turnip-like) (to 40 cm long × 2.5 cm in diameter at the thickest point)
............ ....9 Leaflet pairs 7-12 per pinna; pinna pairs 2-4 per leaf; flowering/fruiting heads on peduncles 6-20 mm long; nectary between lowest pair of pinnae 0.8-2.0 mm in diameter.
............ ....9 Leaflet pairs 19-38 per pinna; pinna pairs 1-2 per leaf; flowering/fruiting heads sessile or on peduncles to 5 mm long; nectary between lowest pair of pinnae 1.4-3.0 mm in diameter
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