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FNA | Family List | FNA Vol. 9 | Rosaceae | Crataegus

66. Crataegus populnea Ashe, Ann. Carnegie Mus. 1: 395. 1902.

Poplar hawthorn

Crataegus compta Sargent; C. iracunda Beadle var. populnea (Ashe) Kruschke; C. luxuriosa Sargent

Shrubs or trees, 60 dm. Stems: twigs: new growth reddish green, glabrous, 1-year old reddish brown, sometimes dark, older mid gray; thorns on twigs recurved, 2-years old dark blackish red, ± shiny, ± slender, 3–5 cm. Leaves: petiole 2–4 cm, glabrous, eglandular or sparsely glandular; blade ± ovate, 4–7 cm ˂length/width = to 1.5˃, subcoriaceous, base broadly rounded to broadly cuneate, rarely truncate, lobes 3–5 per side, sinuses usually shallow, lobe apex acute to acuminate, margins strongly serrate, veins 5 or 6 per side, apex acuminate, adaxial surface glabrate to appressed-hairy young, glabrescent; ˂extension-shoot leaf blades widest 2/5 from base, length/width = 1.3–1.4, sinuses not deep, LII less than 25%, base broadly cuneate, rarely truncate˃. Inflorescences 5–12-flowered; branches glabrous; bracteoles ˂few, very narrow˃, margins glandular. Flowers 16–18 mm diam.; hypanthium glabrous; sepals narrowly triangular, ˂5–6 mm˃, margins subentire, ˂abaxially glabrous˃; stamens 6–10, anthers red to purple; styles 3 or 4. Pomes reddish orange to bright red, suborbicular to oblong, 8–11 mm diam.; ˂flesh hard˃; sepals commonly erose, patent-reflexed; pyrenes 3 or 4, dorsally grooved. 2n = 68.

Flowering Apr–May; fruiting Sep–Oct. Brush, fencerows; 10–400 m; Ont.; Mich., N.Y., Ohio, Pa., Va., W.Va., Wis.

Crataegus populnea occurs from Wisconsin to New York, to Ohio, and Virginia; it is common at least from southern Ontario to Pennsylvania. Dubious specimens from Georgia and South Carolina have small leaves and are only differentiated from C. iracunda (ser. Tenuifoliae) by their more coriaceous nature. Being out of range for C. populnea, they may represent an odd form of C. iracunda.

Crataegus compta is a variant with more or less pyriform-oblong pomes. Crataegus populnea might be mistaken for C. macrosperma but it has more coriaceous leaves, usually significantly larger in the area of sympatry, and a harder fruit.


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