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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 Ziziphus

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1 Leaf undersurfaces glabrous; stipular spines 15-40 mm long
1 Leaf undersurfaces densely white- or gray-tomentose; stipular spines 2-3 mm long
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