1	"Leaves even-pinnate, with 1-5 pairs of leaflets; fruits drupes or schizocarps splitting into 5 indehiscent mericarps"	2
1	"Leaves odd-pinnate with 1-3(-7) leaflets; fruits usually capsules, sometimes schizocarps splitting into dehiscent or indehiscent mericarps, rarely the locules completely separate"	4
2	"Leaves with 1 pair of leaflets; plants trees or shrubs; spines usually present on the stems above the leaves, often branched; fruits drupes"	Balanites
2	"Leaves with 2-5 pairs of leaflets; fruits schizocarps splitting into 5 indehiscent mericarps"	3
3	"Plants annuals or short-lived herbs; leaves opposite; styles up to 4 mm long or absent"	Tribulus
3	"Plants shrubs, subshrubs, or shrublets; at least the lower leaves alternate; styles more than 4 mm long"	Kelleronia
4	"Petals absent; stamens 5; fruits capsules with green longitudinal bands; plants herbs or shrubs"	"Seetzenia {Seetzenia lanata}"
4	"Petals present; stamens 8-10; fruits schizocarps or capsules, without green longitudinal bands; plants small, prostrate herbs"	5
5	"Stipules free, spinescent or small and pointed; fruits obconical capsules, pubescent"	Fagonia
5	"Stipules more or less fused, membranous or herbaceous; fruits schizocarps, or more or less ovoid glabrous capsules, rarely the locules amost free"	6
6	"Filaments with basal appendages; fruits usually schizocarps, mericarps opening septicidally or indehiscent, rarely the locules almost free"	Tetraena
6	"Filaments without basal appendages; fruits loculicidal capsules"	Melocarpum