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Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

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
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