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Keyed in multiple places:

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Key to Fabaceae, Key C: woody legumes with evenly 1-pinnately compound leaves with 2 or more leaflets
[subfamilies Faboideae and Caesalpinioideae]

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1 Flowers with 5 petals, 2 fused to form the keel (papilionaceous); corolla rose, yellow, orange, red, pink, or white; [subfamily Faboideae].
  2 Lianas climbing by twining; stamens 9, monadelphous
  2 Shrubs; stamens 10, diadelphous (9 and 1).
    3 Leaflet pairs 10-25; [widespread]
    3 Leaflet pairs 4-6.
      4 Leaflets 10-25 mm long; corolla 15-20 mm long, yellow; [non-native cultivated and sparingly established]
      4 Leaflets 3-11 mm long; corolla 8-11 mm long, pink or white; [native, s. TX]
1 Flowers with 5 or 3 petals, all distinct (caesalpinaceous); corolla yellow, orange, red, or pink; [subfamily Detarioideae or Caesalpinioid clade].
        5 Large tree; sepals 4; petals 3; functional stamens 3; [subfamily Detarioideae]
        5 Shrub or small tree (< 5 m tall); sepals 5, petals 5, functional stamens 6-10; [Caesalpinoid clade].
          6 Trees; filaments of the 3 lower stamens curved; petiolar gland absent; [introduced in s. FL]
          6 Shrubs or trees; filaments of all stamens straight; petiolar and/or rachis gland(s) present or absent; [collectively more widespread].
             7 Leaflets 0.6-1.0 cm long, coriaceous, the venation raised-reticulate below; functional stamens 10; [s. TX]
             7 Leaflets 1.5-10.5 cm long, herbaceous; functional stamens 6-7 (10 in S. surattensis); [collectively more widespread, but especially FL and s. TX]

Key to Fabaceae, Key G: herbaceous legumes with once-pinnately, even-pinnately compound (or 'palmately' 2-foliolate) leaves with 2 or more leaflets
[subfamilies Faboideae and Caesalpinioideae]

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1 Flowers nearly regular; stamens 5-10, separate; [subfamily Caesalpinioideae, tribe Cassieae].
  2 Leaflets 5-25 pairs, each leaflet 0.5-1.5 cm long; stipules persistent, striate
  2 Leaflets (2-) 3-12 pairs, each leaflet 1.5-12 cm long; stipules caduceus, small, not striate
1 Flowers papilionoid; stamens diadelphous or monadelphous; [subfamily Faboideae].
    3 Tendrils lacking on all leaves; stamens monadelphous or diadelphous.
      4 Leaflets 2 per leaf; [tribe Aeschynomeneae]
      4 Leaflets 4-60 per leaf.
        5 Floating aquatic with stems swollen, inflated
        5 Terrestrial plants with stem not swollen
          6 Leaflets 20-60 per leaf; strong herbs (or woody) 1-4 m tall, simultaneously erect, > 1 m tall, and with stems usually > 5 mm in diameter
             7 Fruit a loment, with single-seeded segments separated by sutures; stamens monadelphous or diadelphous in 2 phalanges of 5; [tribe Aeschynomeneae]
             7 Fruit a legume; stamens diadelphous; [tribe Sesbanieae]
          6 Leaflets 4-18 per leaf; weak or sprawling herbs to 1.5 m long, with weak stems usually < 5 mm in diameter (or if thicker, then < 1 m long; stamens monadelphous or diadelphous.
               8 Leaflets 4 per leaf; stamens monadelphous; [tribe Dalbergieae]
               8 Leaflets 4-16 per leaf; stamens monadelphous, diadelphous (9 and 1, or 5 and 5)
                 9 Stamens monadelphous or diadelphous in 2 phalanges of 5 and 5; [tribe Aeschynomeneae]
                 9 Stamens diadelphous (9 and 1); [tribe Fabeae]
    3 Tendrils present in the terminal position on some or all leaves; stamens diadelphous; [tribe Fabeae].
                   10 Stipules foliaceous, typically larger than the leaflets
                   10 Stipules smaller, typically much smaller than the leaflets.
                     11 Calyx lobes 2-4× as long as the calyx tube; [rare waif]
                     11 Calyx lobes 1-2× as long as the calyx tube; [collectively widespread and common].
                       12 Style stout, flattened or folded, with a dense longitudinal band of hairs longitudinally arrayed along the inner side; stems ridged, angled, or longitudinally winged; leaflets 2-6 (-8) cm long; calyx 5-12 mm long
                       12 Style slender and hair-like, terete (round in ×-section), glabrous except for a ring of short hairs just below the stigma; stems ridged or angled, but not longitudinally winged; leaflets 0.5-4.5 cm long (except larger in a few waifs); calyx 2-8 mm long (except larger in a few waifs)
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