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Article from Bean's Trees and Shrubs Hardy in the British Isles
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'Crataegus crus-galli' from the website Trees and Shrubs Online (treesandshrubsonline.
A small, usually more or less flat-topped tree, with spreading, often horizontal branches; young shoots quite glabrous; thorns rigid, 11⁄2 to 3 in. long, ultimately twice as long, and branched. Leaves obovate, always tapered and without teeth towards the base, the apex toothed, rounded or abruptly pointed; 1 to 4 in. long, 1⁄3 to 11⁄2 in. wide; dark glossy green and perfectly glabrous; stalk 1⁄4 to 1⁄2 in. long. Flowers white, 2⁄3 in. across, produced in June on smooth-stalked corymbs 2 to 3 in. wide; stamens ten, anthers pink; styles usually two. Fruit nearly globose, 1⁄2 in. diameter, deep red.
Native of eastern N. America; introduced in 1691. This beautiful and distinct thorn has much to recommend it. Its habit is striking and picturesque, it blossoms freely, its leaves change to brilliant scarlet in autumn, and its fruits, ripening in October and persisting until spring, make one of the brightest of early winter pictures. The species is, moreover, one of the hardiest and most thriving of its kind.
The true species is rare in gardens. What usually passes under this name is C. prunifolia ‘Splendens’.
Synonyms
Mespilus fontanesiana Spach
C. olivacea Sarg