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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 Crataegus

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1 Leaf blades mostly ovate or deltate, widest below their midpoint; blade base subcordate, truncate, rounded, or abruptly contracted
1 Leaf blades elliptical, rhomboid, suborbicular, obovate or oblanceolate, widest at midpoint or beyond midpoint; blade base usually cuneate.
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