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Keyed in multiple places:

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Key to Cajanus

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1 Erect shrub, 1-3 m tall; terminal leaflets 2.8-10 cm long × 0.5-3.5 cm wide; legumes 4-8.5 cm long × 0.6-1.2 cm wide
1 Liana, to 2 m long; terminal leaflets 1.2-4 cm × 0.8-1.5 (-3) cm wide; legumes 1.2-2.5 cm long × 0.4-0.6 cm wide

Key to Fabaceae, Key A: woody legumes with all leaves 1-, 2-, or 3-foliolate, or reduced to flattened phyllodia or phyllodial spines

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1 Stamens numerous; inflorescences of many flowers arranged in a closely packed sphere or cylinder; leaves replaced by phyllodes, these leathery in texture and often crescent-shaped; [Mimosoid clade]
1 Stamens 10 (or fewer); inflorescences various, the flowers larger and more diffuse; leaves 1-, 2-, or 3-foliolate, or reduced to phyllodial spines; [subfamily Faboideae or Cercidioideae]
  2 Leaves 1- or 2-foliolate and > 2 cm wide; trees, shrubs, or lianas.
    3 Seeds 1-2 (-4) per fruit; corolla pale yellow, pale pink, or white; longest petals 7-10 mm long; [subfamily Faboideae]
    3 Seeds > 5 per fruit; corolla purplish-pink, bright pink, or white; longest petals 10-100 mm long [subfamily Cercidioideae]
      4 Leaves with a rounded to apiculate apex; flowers strongly bilaterally symmetrical, “pseudopapilionoid”; petals 0.8-1.5 cm long; legumes 4-10 cm long; [natives and exotics, and widely cultivated]
      4 Leaves either unifoliolate with a deeply notched apex or 2-foliolate; flowers slightly bilaterally symmetrical; petals 1.5-8 (-10) cm long; legumes 7-30 cm long; [exotics, of FL peninsula].
        5 Shrub or tree; petals 3-8 (-10) cm long
        5 Liana (climbing by twining and by tendrils); petals 1.5-2.0 cm long
  2 Leaves 3-foliolate, or reduced to phyllodial spines, or 1-foliolate (but then < 2 cm wide); shrubs or woody vines (rarely trees in Erythrina); [subfamily Faboideae].
          6 Woody vine (Pueraria, a robust herbaceous vine, is also keyed here as a failsafe).
             7 Leaves glandular beneath; terminal leaflets 1.3-4 cm long
             7 Leaves eglandular beneath; terminal leaflets 5-20 cm long.
               8 Terminal leaflet 1.5-2.5× as long as wide; corolla yellow; legume 4-6 cm wide; seeds 2-3 cm wide
               8 Terminal leaflet 0.8-1.3× as long as wide; legume 0.8-1.3 cm wide; seeds < 1 cm wide; corolla purplish or red.
                 9 Calyx 4.5-6 mm long; leaflets unlobed; [tribe Phaseoleae]
                 9 Calyx 10-12 mm long; leaflets generally lobed; [tribe Phaseoleae]
          6 Shrub or tree.
                   10 Shrub with angled or flanged green twigs; leaves palmately trifoliolate, unifoliolate, or reduced to spine-tipped phyllodes; [introduced]; [tribe Genisteae].
                     11 Flowers red-purple; calyx 2-3 mm long; [tribe Galegeae]
                     11 Flowers bright yellow; calyx 3-15 mm long; [tribe Genisteae]
                       12 Leaves all reduced to phyllodial spines; flowers axillary; calyx 10-15 mm long
                       12 Leaves with normal lamina, either 1-foliolate or 3-foliolate; flowers in terminal racemes; calyx 3-6 mm long.
                          13 Leaves 3-foliolate lower on the stem, often 1-foliolate above; corolla 15-22 mm long
                          13 Leaves 1-foliolate throughout; corolla either 10-14 mm or 20-25 mm long
                            14 Corolla 10-14 mm long; fruits 1.5-3 cm long
                            14 Corolla 20-25 mm long; fruits 5-10 cm long
                   10 Shrub or tree with twigs various, but not conspicuously green or flanged; leaves pinnately trifoliolate or unifoliolate.
                              15 Leaflet margins toothed; [rare waif]; [tribe Trifolieae]
                              15 Leaflet margins entire; [collectively common and widespread].
                                16 Leaves unifoliolate; [tribe Genisteae]
                                16 Leaves pinnately trifoliolate.
                                  17 Corolla 15-50 mm long, yellow or scarlet; legume with several seeds; leaflets lobed or not; [tribe Phaseoleae]
                                    18 Corolla 15-21 mm long, yellow; leaflets unlobed; leaflets densely yellow glandular-punctate
                                    18 Corolla 30-50 mm long, scarlet; leaflets lobed or not; leaflets eglandular
                                  17 Corolla 8-15 mm long, purplish, pink, or white; legume 1-seeded; leaflets not lobed.
                                       19 Foliage glandular-punctate; [tribe Psoraleae]
                                       19 Foliage eglandular; [tribe Desmodieae]