21. Acer nigram (3lichaux), the Black Sugar Maple. This plant is a native of similar situations with the last, of which perhaps it is only a variety.
22. Ater Lohdii (Tenore), Lobel's Maple, is found among the mountains in the north of the kingdom of Naples.
23. A r r rriororpou (Michaux ; A. dayrm•lum. Willdenow), Sir Charles Wager's Maple is found in most parts of North America on the eastern side, where it is commonly called White Maple. It grows with great rapidity, and in extremely common in the plantations of all Europe, where it is remarkable for the deep crimson hue of its leaves in autumn. Its wood is light, and of little or no value except to the turner. It is said to make excellent charcoal for gunpowder. The nurserymen usually call this species the Cut-Leaved Scarlet Maple.
24. Accr rubrum (Linnreus), the Red or Maple. The deep-red colour of the flowers in the spring, and of the keys and leaves in autumn, have given rise to the name of this species, which is found, from Canada to Florida, growing in swamps along with alders. Its wood is used by the Americans for articles of furniture, and is also in request for the stocks of rifles—for which, when it is what they call `curled,' its toughness renders it well adapted. Two varieties of this
species are cultivated in this country, under the names of A. coccineurn and A. intermedium.
25. A cer circinaturn (Pursh), the Curled Maple, grows on the north west coast of North America, and is a small, scrubby, worthless tree.
Cultication.—The hardy maples, which are the only kinds of any importance in this country, are all increased either by seeds or layers. The European species readily yield their keys, which should be gathered when fully ripe, and immediately buried in heaps of river sand, where they may remain till the following February; they may then be sown in beds, rather thinly, and, when one year old, should be transplanted, and treated like other forest trees. They ought never to be headed back, as oaks and Spanish chestnuts are. From layers they all make excellent plants very rapidly. They are occasionally budded upon the common sycamore, but this mode is little practised in England.