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Its long, taper-pointed leaves, with coarse, very sharp serratures, appear to distinguish it satisfactorily from the P. Richardi of the northwest of Asia." There seems to be no doubt as to the perfect hardiness of the Japanese Zelkowa in Britain, and it is decidedly well worth growing as an ornamental tree apart from its probable value as a timber producer.
According to Loudon, it was introduced to this country in 1760, and it appears to have been planted both at Kew and Syon at about that date. A very full account of the history, etc., of the Zelkowa, from which Loudon largely quotes, was presented to the French Academy of Science by Michaux the younger, who speaks highly of the value of the tree.
Koch Dendrologie, zweit theil, sweit. Abtheil. p. 425. Showing peculiar habit of branching. This is a form of which I do not know the origin or history. It is simply a weeping variety of the common Zelkowa. I first saw it in the Isleworth Nurseries of Messrs. C. Lee & Son, and a specimen presented by them to Kew for the aboretum is now growing freely.
The oldest tree existing in France at the time of the publication of Loudon's great work, was one in the Jardin des Plantes, which in 1831 was about 60 feet high. "There is, however, a much larger Zelkowa on an estate of M. le Comte de Dijon, an enthusiastic planter of exotic trees, at Podenas, near Nerac, in the department of the Lot et Garonne.
Planera Richardi, Michx. Fl. bor. Amer. 2, p. 248; C.A. Meyer, Enumer. Causas. Casp., n. 354; Dunal in Bulletin Soc. cent d'Agricult. de l'Herault. ann. 1841, 299, 303, et ann. 1843, 225, 236. Loudon, Arbor, et Frut. Brit., vol. 3, p. 1409. Planera crenata, Desf. Cat. Hort. Paris et hortul, fere omnium. Michaux fil. Mem. sur le Zelkowa, 1831. Planera carpinifolia, Watson, Dend. Brit., t. 106.
All the Zelkowas are easily propagated by layers or by grafting on the common elm. Zelkcova crenata The Caucasian Zelkowa is a native of the country lying between the Black and the Caspian Sea between latitudes 35 deg. and 47 deg. of the north of Persia and Georgia.
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