Flora of the Southeastern United States
2022 Edition

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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

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.

1 Leaf blades usually < 12 mm wide and < 2 cm long (on floreal shoots).
..2 Leaf blades often nearly wide as long, blade broadly obovate or suborbicular.
....3 Leaves denticulate or remotely toothed, rarely lobed; petiole glabrate; shrub usually < 1m tall
....3 Leaves sharply toothed, often lobed; petiole hairy; shrub or tree > 1 m tall
..2 Leaf blades 1.5-2× long as broad, mostly spatulate or oblanceolate.
......4 Leaves and flower pedicels glabrate
......4 Leaves and flower pedicels pubescent to tomentose.
........5 Leaf blade attenuate along most of petiole, margin subentire, obscurely toothed near apex
........5 Leaf blade cuneate at base, margin distinctly toothed or dentate near apex.
..........6 Thorns 1-3 cm long; plant usually < 1 m tall
..........6 Thorns 3-6 cm long; plant usually 1-2 m tall
1 Leaf blades mostly > 12 mm wide and > 2 cm long.
............7 Leaf margin mostly subentire; may have glandular-denticulate teeth or 3 lobelike points on distal part of blade.
..............8 Leaves often with 3 lobelike points near apex.
................9 Leaves persistently tomentose; fruit subglobose
................9 Leaves pubescent to glabrate; fruit pyriform
..............8 Leaves denticulate or subentire to apex, rarely with any lobelike points.
..................10 Thorns abundant, present at nearly every node and > 3 cm long
..................10 Thorns less numerous, most < 3 cm long.
....................11 Leaves elliptic-obovate, blade attenuate for about half of petiole
....................11 Leaves generally spatulate, blade attenuate for most of petiole
............7 Leaf margin toothed along at least half of margin, the teeth fine, acute, obtuse or dentate.
......................12 Floreal leaves often rhomboid or broadly elliptical; twigs and branches usually not drooping.
........................13 Leaves distinctly sharply toothed and/or lobed; blades broadly ovate on terminal shoots and > 3.5 cm long
........................13 Leaves with small or blunt teeth, mostly unlobed; blades rhombic, obovate or orbicular on terminal shoots, < 3.5 cm long.
..........................14 Stamens 10 per flower; terminal shoot leaves broadly rhombic to suborbicular
..........................14 Stamens 20 per flower; terminal shoot leaves usually orbicular or broadly obovate
......................12 Floreal leaves mostly obovate or spatulate; leading twigs or branches drooping or pendulous.
............................15 Leaf apex rounded or with an abrupt short point, margins finely or sharply toothed beyond middle of blade; terminal shoot leaves unlobed to very obscurely lobed.
..............................16 Leaves and inflorescence thinly hairy or glabrate.
................................17 Leaves and inflorescence sparsely hairy; pyrenes 3-5 per fruit
................................17 Leaves and inflorescence essentially glabrous; pyrenes 2 or 3 per fruit
..............................16 Leaves and inflorescence densely hairy.
..................................18 Leaf teeth sharp, conspicuously black-glandular, apex rather jagged-toothed
..................................18 Leaf teeth small, fine or partly crenate.
....................................19 Leaves persistently pubescent, apex usually rounded
....................................19 Leaves pubescent when young, later glabrate, apex with a short point
............................15 Leaf apex 3-lobed or with 3-5 distinct points or several larger teeth; terminal shoot leaves moderately to deeply lobed.
......................................20 Fruit usually < 10 mm diameter, with calyx collar elevated.
........................................21 Leaf shape often spatulate, lobes and teeth blunt to subacute
........................................21 Leaf shape often narrowly obovate, lobes and teeth dentate or sharp
......................................20 Fruit often 10 mm diameter or more, calyx sessile.
..........................................22 Terminal shoot leaves ovate, tomentose, sharply serrate and deeply incised
..........................................22 Terminal shoot leaves mostly obovate, pubescent or glabrate.
............................................23 Leaves partly oblanceolate, usually with 2 pairs of main lateral veins; fruit 10-14mm, flesh dense
............................................23 Leaves obovate or sub-rhombic, with 3-5 pairs of main lateral veins; fruit 12-15 mm, flesh soft.
..............................................24 Leaf base narrowly cuneate; lobes and teeth obtuse or rounded
..............................................24 Leaf base short-cuneate or acute; lobes or teeth acute