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They are ordinarily called pyramidal or fastigiate forms, and as far as their history goes, they arise suddenly in large sowings of the normal species. The fastigiate birch was produced in this way by Baumann, the Abies concolor fastigiata by Thibault and Keteleer at Paris, the pyramidal cedar by Paillat, the analogous form of Wellingtonia by Otin.
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