A large trade is done in some kinds of Maple, of which the best-known kinds, perhaps, are the Common Sycamore (A. Pseudaplatanus) and the Norway Maple (A. platcmoides). Of the Syca-more there are several varieties, such as alho-variegatum, white and green; flavo - marginatum, yellow edged; atro - purpureum, purplish; Leopoldi, silvery; the Corstorphine Maple (lutescens), golden leaved; Prinz Handjery, Webbianum, Simon Louis, Worlei, and others. One of the most popular forms of the Norway Maple is Schwedleri, with bronzy-red leaves, but there are others, like Reitenbachi, aureo-varie-gatum, laciniatum, purpureum rubrum, etc. The Common English Maple (A. campestre) also has several varieties, including a variegated one, but is not so extensively grown in nurseries. The common forms of the above are raised from seeds, but the varieties are usually budded.

The Japanese Maples are now largely grown for the decoration of parks and large gardens, and are to be had in many varieties. These are chiefly derived from A. japonicum (fig. 408) and A. palmatum. The best - known varieties of japonicum are aureum, compactum, laciniatum, rufinerve albo-lineatum. The palmatum section is more diverse, and consists of the dis-sectum and septemlobum groups - both charming, and remarkable for the numerous dissections of the leaves and the brilliancy of their tints. The choicer varieties are usually grafted on stocks of the common forms, and these are raised from seeds. The green-leaved Box Elder (A. Negundo or Negundo fraxinifolium) is a very useful plant, but chiefly serves as a stock upon which the variegated silver and golden forms are budded.

Of late years attention has been given to other species of Maple, notably dasycarpum, a fine Japanese species with several varieties; rubrum, the Canadian scarlet-leaved Maple; saccharinum, the North American Bird's Eye or Sugar Maple; and tataricum or cordifolium, with a fine coloured variety called Ginnala.

Acer japonicum.

Fig. 408. - Acer japonicum.