1A.	Anthers provided with an apical gland between the theca of the anther	2
1B.	Anthers without apical gland between theca	4
2A.	Herbaceous plants, unarmed	Neptunia
2B.	Creeping shrubby or arboreal plants, armed with spines	3
3A.	Plants armed with stipular spines; creeping shrubs, growing in colonies; 50 cm tall or less; inflorescences arranged in spherical capitula	Strombocarpa
3B.	Plants armed with axillary spines, uninodal, solitary or in pairs or in spinescent shoots; shrubby or treelike, erect, not growing in colonies, more than 1 m tall; inflorescences arranged in oblong spikes	Neltuma
4A.	Plants armed with thorns or unarmed; shrubs with pink flower capitula and only 1–2 pairs of pinnae per leaf; fruit flattened, with a continuous and persistent margin, the valves separating from it when the legume matures, or with a tetragonal appearance (2 entire valves narrower or equal to the width of the persistent margin) separating into 2 equal valves and each of these dividing into 2 merivalves when the fruit ripens; inflorescence peduncles with or without spines	Mimosa
4B.	Unarmed plants	5
5A.	Prostrate herbaceous or sub-shrubs; fruit 9 mm wide or narrower, seeds arranged obliquely	Desmanthus
5B.	Shrubs or trees; fruit 9 mm wide or wider; seeds arranged longitudinally, transversely, or obliquely	Leucaena