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From Korshinsky's survey of varieties with cut leaves or laciniate forms the following cases may be quoted. In the year 1830 a nurseryman named Jacques had sown a large lot of elms, Ulmus pedunculata. One of the seedlings had cut leaves. He multiplied it by grafting and gave it to the trade under the name of U. pedunculata urticaefolia. It has since been lost.
In the year 1821 the bird's cherry, or Prunus Padus, produced a weeping variety, and in 1847 the same mutation was observed for the allied Prunus Mahaleb. Numerous other instances of the sudden origin of weeping trees, both of conifers and of others, have been brought together in Korshinsky's paper.
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