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Ulmus Abelicea, Sibth & Sm. Prod. Fl., Graeca, i., p. 172. Planera Abelicea Roem. & Schltz. Syst., vi. p. 304; Planch, in Ann. des Sc. Nat. 1848, p. 282. Abelicea cretica, Smith in Trans. Linn. Sov., ix., 126.
I suspect that the Zelkova crenata var. repens of M. Lavallee's "Aboretum Segrezianum" and the Planera repens of foreign catalogues generally are identical with the variety now mentioned under the name it bears in the establishment of Messrs. Lee & Son. Z. acuminata is one of the most useful and valuable of Japanese timber trees. It was found near Yeddo by the late Mr.
Until recently they were considered to belong to the genus Planera, which, however, consists of but a single New World species; now, they properly constitute a distinct genus, viz., Zelkova, which differs materially from the true Planer tree in the structure of the fruit, etc.
Some of the fossil plants to which Professor Heer has given new names have been regarded as Recent species by other eminent naturalists. Thus, one of the trees allied to the elm Unger had called Planera Richardi, a species which now flourishes in the Caucasus and Crete.
Professor Heer had attempted to distinguish it from the living tree by the greater size of its fruit, but this character he confessed did not hold good, when he had an opportunity of comparing all the varieties of the living Planera Richardi which Dr. Hooker laid before him in the rich herbarium of Kew.
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