Article from Bean's Trees and Shrubs Hardy in the British Isles
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'Crataegus × lavallei' from the website Trees and Shrubs Online (treesandshrubsonline.
The tree on which this name is founded arose in the Segrez Arboretum, France, and was first described in 1880. Three years later Carrière published an account (Rev. Hort., 1883, p. 108) of a very similar hawthorn, which was distributed, and long known as, C. carrierei. In a botanical sense this name must be regarded as a synonym of C. × lavallei, but it is desirable to preserve the name in cultivar form, in order to distinguish Carrière’s plant from the Segrez form. Whether the latter was ever propagated and distributed is not known.
C. × grignonensis – In the original printing it was stated that this hybrid resembles C. × lavallei ‘Carrierei’ in the colour of its fruits. In fact, they are red, not orange-red as in ‘Carrierei’.
Another hybrid from C. stipulacea, which it resembles more closely than does C. × lavallei. It was first observed at Grignon in France in 1873 and probably originated there. It has much the same garden value as C. × lavallei ‘Carrierei’, which it resembles in the long persistent leaves and fruits but from which it differs in its glabrous shoots.