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Key to Senegalia

Fabaceae

Senegalia

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1 Scrambling shrub or woody liana (climbing by catclaw prickles); pinnae 8-22 pairs per leaf; leaflets 30-54 pairs per pinna; [introduced in FL]
1 Erect thicket-forming shrub or small tree; pinnae 1-11 pairs per leaf; leaflets 2-35 pairs per pinna; [natives, e. and s. TX westwards and southwestwards].
  2 Flowers in spherical heads; pinnae 1-11 pairs per leaf; leaflets (3-) 5-35 per pinna.
    3 Pinnae (4-) 6-11 per leaf; leaflets (12-) 15-35 per pinna; leaflets 3-4 mm long
    3 Pinnae 1-3 (-4) per leaf; leaflets (3-) 5-12 per pinna; leaflets (4-) 5-9 (-12) mm long
  2 Flowers in cylindrical spikes; pinnae 1-3 (-4) pairs per leaf; leaflets 2-6 per pinna.
      4 Legumes subcoriaceous, twisted when mature; leaflets 3-6 mm long; petioles usually 2-5 mm long on leaves on spur shoots
      4 Legumes papery, planar when mature; leaflets 5-9 (-12) mm long; petioles usually (4-) 6-11 mm long on leaves on spur shoots