Article from Bean's Trees and Shrubs Hardy in the British Isles
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'Rhamnus × hybrida' from the website Trees and Shrubs Online (treesandshrubsonline.
An evergreen or partially evergreen shrub up to 12 ft high, of spreading habit, more in diameter than it is high; shoots glabrous. Leaves ovate to oblong, rounded or widely tapered at the base, pointed, 11⁄2 to 4 in. long, 3⁄4 to 13⁄4 in. wide, shallowly and finely toothed, glabrous on both surfaces, rather pale green; about seven veins each side the midrib; leaf-stalk 1⁄6 to 1⁄3 in. long.
The original plant of R. × hybrida was raised by L’Héritier shortly before 1778 from seed of a female plant of R. alpina and was described by him in 1788. The pollen-parent, according to him, was certainly R. alaternus.