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Key to Zygophyllaceae

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1 Leaflets 2; [ballast waif].
1 Leaflets (4-) 6-16 (-20); [collectively widespread in our region].
  2 Shrub or small tree; petals blue or purplish; fruit a 5-lobed capsule; [subfamily Larreoideae]
  2 Herb; corolla yellow; fruit a schizocarp separating at maturity into 5 or 10 mericarps; [subfamily Tribuloideae].
    3 Fruit with tubercles, at maturity separating into 10 mericarps
    3 Fruit with spines, at maturity separating into 5 mericarps