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1 Flower heads 4-6 cm in diameter (measured across the full diameter out to the tips of the stamens), with > 20 flowers per head; pinnae 1 pair per leaf; leaflets 4-8 pairs per pinna, 15-60 mm long; shrub 10-20 dm tall; [exotic species of urban and suburban areas]; [section Androcallis]
1 Flower heads 2-3.5 cm in diameter, with 2-8 flowers per head; pinnae 1-3 pairs per leaf; leaflets 5-10 pairs per pinna, 3-7 mm long; shrub or suffrutescent herb 1-6 dm tall; [native species of TX Coastal Plain].
..2 Flowers 1-2 (-3) per head; pinnae (1-) 2-3 pairs per leaf; virgate (wandlike) suffrutescent herb, with an obvious main stem and short side branches; [section Biflorae]