Crataegus sect. Crataegus
Rosaceae subfam. amygdaloideae
trunks 1–few, ± erect, bark flattened-scaly or exfoliating;
compound thorns on trunks present or absent;
thorns on twigs determinate or indeterminate, straight or slightly curved, ± slender unless very short.
blade ± ovate, 1.2–6 cm, ± thin, lobes (0 or)1–4 per side, sinuses shallow or deep, veins 2–8 per side, to lobes and sinuses, sometimes glossy.
alternate, sometimes opposite, simple, sometimes pinnately compound;
stipules present or absent.
branches glabrous or pubescent;
symmetric bracteoles present, basal stipuliform, falcate bracteoles absent.
post-mature petals pale paper brown;
stamens [10–]20, anthers ivory, pale yellow, pink to purple, or reddish.
torus absent or minute;
carpels 1–5(–8), distinct or +/- connate (Maleae), free or +/- adnate to hypanthium (many Maleae), styles distinct or +/- connate (some Maleae);
ovules (1 or)2(–5+), collateral, clustered, or biseriate.
follicles aggregated or not, capsules, drupes aggregated or not, aggregated drupelets, pomes, or aggregated nutlets, rarely achenes or aggregated achenes;
styles persistent or deciduous, not elongate (elongate in Gillenieae).
vermillion to red or orange-red [black];
pyrene sides plane or grooved.
= 8, 9, 15, 17.
Crataegus sect. Crataegus
Rosaceae subfam. amygdaloideae
Species 28 (5 in the flora).
Four of the series recognized in sect. Crataegus are represented in the flora area.
Section Crataegus is extended here beyond ser. Crataegus to include three related North American series that have only determinate thorns and that have been suggested by E. Y. Y. Lo et al. (2009) to represent a separate subclade of hybrid origin.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Cyanogenic glycosides are usually present in Amygdaloideae; sorbitol is present.
The name Amygdaloideae Arnott (1832) has priority over Spiraeoideae Arnott (1832), used by D. Potter et al. (2007), because Amygdalaceae (1820) is an earlier conserved name.
Tribes 9, genera 55, species ca. 1300 (9 tribes, 38 genera, 361 species, including 20 hybrids, in the flora)
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Veins to all sinuses; styles and pyrenes 1–3 | → 2 |
1. Veins only to deeper sinuses; styles and pyrenes 3–5 | → 3 |
2. Pomes bright to dark red, 6–14 mm diam., ± orbicular to ± cylindric; inflorescence branches glabrous; thorns on twigs indeterminate (when appearing terminal on often leafy twigs), sometimes determinate (aphyllous and lateral); trunk bark flattened-scaly, exfoliating in elongate strips; pyrene sides grooved. | C. ser. Crataegus |
2. Pomes bright, glossy red, 4–6 mm diam., ellipsoid to sometimes orbicular; inflorescence branches densely pubescent; thorns on twigs determinate; trunk bark smooth, thin, exfoliating in irregular flakes; pyrene sides plane. | C. ser. Apiifoliae |
3. Trunk bark flattened-scaly in elongate strips; leaf blades 3–6 cm, broad. | C. ser. Cordatae |
3. Trunk bark exfoliating with smooth, thin flakes; leaf blades 1.5–3 cm, narrow. | C. ser. Microcarpae |
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