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Key to Crataegus, Key A: hawthorns with leaf blades widest below midpoint;
blade bases subcordate, truncate, rounded, or abruptly contracted

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1 Primary lateral veins of lobed leaves run to sinuses between lobes as well as to points of lobes, in some or most leaves [see also Crataegus viridis].
..2 Leaves usually pubescent or villous abaxially or on petiole, especially when young; inflorescence hairy (villous, pubescent or tomentose).
....3 Styles usually 2; fruit < 9 mm broad, usually oval or elliptic in shape; [widespread species]
....3 Styles 3 to 5; fruit > 9 mm broad, subglobose; [rare Arkansas endemic nothospecies]
......4 Short-shoot leaf blades 2-3 cm long, often broad as long
......4 Short-shoot leaf blades 3-4 cm long, longer than broad
..2 Leaves and inflorescence glabrous [commonly cultivated species]
........5 Leaf lobes with few serrations; pyrene 1 per fruit; thorns usually 1-2 cm long; [exotic]
........5 Leaf lobes with numerous serrations; pyrenes 5 per fruit; thorns usually 3-5 cm long; [native]
1 Primary lateral veins of lobed leaves run only to lobe points, excepting on vigorous sprouts.
..........6 Sepals foliaceous, equal or exceeding petal length in flower and persistent on fruit
..........6 Sepals not foliaceous, much shorter than petals.
............ 7 Leaves abaxially with whitish hair tufts in proximal main vein axils, especially in spring; [Virides series and hybrids].
............ ....9 Leaves glabrous, except for hair tufts.
............ ..8 Leaves often ovate to rhomboid or suborbicular, bases cuneate or rounded.
............ ........11 Leaves glabrous except for hair tufts; most leaves ovate, unlobed, rounded at base
............ ........11 Leaves pubescent, particularly when young; leaves ovate or rhomboid, often lobed, bases cuneate; [interserial hybrids].
............ ..........12 Leaves most pubescent adaxially, teeth and lobes sharp; sepals glandular-serrate
............ ..........12 Leaves most pubescent abaxially; teeth and lobes subacute; sepals subentire.
............ ............ ....15 Terminal shoot leaves often suborbicular, lobed 20% or less to midrib.
............ 7 Leaves lacking hair tufts; hairs, if present, dispersed over veins or surface of leaves.
............ ............ ..........18 Anthers pink or reddish.
............ ............ ............ 19 Anthers <1.5 mm long; fruit flesh dense; [rare Missouri endemic]
............ ............ ............ 19 Anthers 1.5-3 mm long; fruit usually soft-fleshed when mature; [widespread in southern Midwest]
............ ............ ..........18 Anthers white or yellowish.
............ ............ ............ ..20 Leaves moderately lobed (10-25 % to midrib), base truncate or subcordate on terminal shoots.
............ ............ ............ ....21 Fruit usually red; leaves plane; [widespread species]
............ ............ ........17 Leaves variously pubescent or glabrous; petiole typically glandular, particularly in spring; inflorescence pubescent or glabrous.
............ ............ ............ ......22 Leaf blades on terminal shoots commonly 8-12 cm long.
............ ............ ............ ..........24 Leaf base often broadly cuneate; anthers white or ivory; habit usually shrubby
............ ............ ............ ............ 25 Leaf blades often wide as long; stamens usually 20; petiolar glands stalked; sepals pectinate
............ ............ ............ ............ 25 Leaf blades longer than broad; stamens 5-10; petiolar glands sessile, small or sparse; sepals glandular-serrate.
............ ............ ............ ......22 Leaf blades on terminal shoots usually < 8 cm long.
............ ............ ............ ............ ....27 Petiole distinctly villous or pubescent, particularly early in growing season.
............ ............ ............ ............ ......28 Pyrenes usually 2 or 3, concave or pitted on inner sides; [interserial hybrids].
............ ............ ............ ............ ........29 Leaves pubescent to villous; stamens 10 or 20; [Crataegus calpodendron hybrid endemics of MO and AR]
............ ............ ............ ............ ............ 31 Terminal shoot leaves ovate or tending toward oval or suborbicular, unlobed or very shallowly lobed.
............ ............ ............ ............ ............ ..32 Petiole eglandular or remotely glandular, unwinged for most of its length; [Molles interserial hybrids]
............ ............ ............ ............ ............ ..32 Petiole with several conspicuous stalked glands, winged near half its length.
............ ............ ............ ............ ............ 31 Terminal shoot leaves broadly ovate or deltate, often lobed 20% or more to midrib.
............ ............ ............ ............ ............ ..........36 Leaves longer than broad, sparsely villous adaxially in spring; [widespread taxa].
............ ............ ............ ............ ............ ............ ........41 Terminal shoot leaves commonly deltate; petiole length often 50-75% as long as blade
............ ............ ............ ............ ............ ............ ............ ..44 Flesh of mature fruit dense or hard; [northern taxa rare in Southeast].
............ ............ ............ ............ ............ ............ ........41 Terminal shoot leaves mostly ovate or near rhombic; petiole length mostly 30-50 % as long as blade.
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