. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 28 BULLETIN 816, U. S. DEPAETMENT OF AGRICULTURE. street planting as usually has been supposed, few of the species being suitable for this purpose and these only in a limited way. The ash-leaved maple, or box elder,^ is native to all of the country east of the Rocky Mountains except the regions near the South Atlantic and Gulf coasts. It is a small, quick-growing tree that wiU thrive almost anywhere, but it reaches maturity early. Because of its early decay and of its being subject to destruction by wind, it should not
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 28 BULLETIN 816, U. S. DEPAETMENT OF AGRICULTURE. street planting as usually has been supposed, few of the species being suitable for this purpose and these only in a limited way. The ash-leaved maple, or box elder,^ is native to all of the country east of the Rocky Mountains except the regions near the South Atlantic and Gulf coasts. It is a small, quick-growing tree that wiU thrive almost anywhere, but it reaches maturity early. Because of its early decay and of its being subject to destruction by wind, it should not be used for street planting where other trees succeed. It would be a good tree for inter- planting were it safe to risk taking out some of the trees at the right time. The objection to using these trees is that they would be so likely to look larger and better than the permanent trees at the time they should be removed that pub- lic opinion would probably resent their removal. There may be conditions requir- ing the use of this tree in regions 6, 7, and 8, but it should be grown only when the other trees suggested for these regions will not succeed. The English maple^ is Ismail, round headed, with small dark-green leaves, useful in re- gions 1, 2, 3, and 4. The Norway maple ^ is round headed and eventually reaches large size, but, as compared with most of the other maples, it is slow growing (fig. 4, C). The persistence of its tendency to form a low head makes it difficult to give it a high head of desirable shape (fig. 20). It is also very thickly branched, and its foliage, being heavy and dark green, permits but little light to pass through. On this account it is rather undesirable for street planting. By severe pruning of the interior of the head this defect may be somewhat. P20042HP Fig. 20.—a Norway maple, as seen in late winter, showing its poor shape when trimmed to a high head. 1 Acer 2 Acer campestre L. ^ Acer platanoides Please note that these images are extrac
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