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Key to Crataegus

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https://fsus.ncbg.unc.edu/main.php?pg=show-key.php&keyid=39984

1 Leaf blades mostly ovate or deltate, widest below their midpoint; blade base subcordate, truncate, rounded, or abruptly contracted Key to Crataegus, Key A: hawthorns with leaf blades widest below midpoint; blade bases 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.
..2 Leaves conspicuously glandular on petiole and teeth, especially when young; leading twigs and branchlets geniculate Key to Crataegus, Key B: hawthorns with leaf blades widest at midpoint or beyond midpoint; blade bases acute or cuneate; leaves conspicuously glandular on petiole and teeth; twigs and branchlets geniculate
..2 Leaves eglandular, or if glandular then twigs relatively straight, not conspicuously geniculate Key to Crataegus, Key C: hawthorns with leaf blades widest at midpoint or beyond midpoint; blade bases acute or cuneate; leaves eglandular, or if glandular then twigs and branchlets not geniculate

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Key to Crataegus