300 Trees for Shade and Ornament 
especially for stately avenues and wide streets. The scanty branch 
system can to some degree be improved upon by proper pruning: It 
has a long leaf period but no attractive coloring, and it is rather uncleanly 
because of shedding its bark. It is adapted to most soils, even wet ones 
(a swamp and overflow tree), and is very light-needing; it transplants 
eashy. 
i’. orientalis Linn. (260), the European Plane-iree, is very much like 
the former, except that it is later in leafing, and with two fruit-balls 
f-om one stem; somewhat denser foliage; more compact habit and pos- 
siLly whiter skin; is free from fungus troubles, but less hardy. 
P. Wrightit Wats. (261), from Arizona, is superior in the shape of 
its deeply indented foliage and deserves trial in southern planting. 
P. cuneaia Willd. (262) and acerifolia Willd. (263) and some varieties 
of these have no particular points of superiority. 
POPLARS 
Populus. This widely distributed genus of some twenty-five species, 
of which eleven are indigenous to North America, is composed of tall 
to small trees, of very rapid growth. They are among the most light- 
needing and most frugal species, adapted to all kinds of soils, the driest 
as well as the wettest, but thrive best on well-watered ones, — the tall 
trees are indeed greedy for water. Tolerably healthy and without 
troubles, except that some sucker undesirably. They are most easily 
transplanted, and most of them hardy. 
The name indicates the popularity as a widely planted tree, on account 
of the ease of its propagation (planting of poles or cuttings), and the 
rapidity of its growth. They have also certain valuable ornamental 
features, the light shade they give, and the lively aspect of their motile 
foliage, quivering in the slightest breeze. 
They are to be used with moderation, mainly in single specimens 
along watercourses and wet meadows, near houses, on avenues, where 
their formal monotony is not objectionable, for highways and as accent 
trees. 
P. deltoidea Marsh. (264) (monilifera or canadensis), Cottonwood, is 
the largest, a native of widest range and also one of the most ornamen- 
tal, with its large, clean, glossy foliage, moving in every breeze; with the 
longest leaf period, its foliage coming early and staying late, turning 
pale yellow in the fall. It is a good street tree, as it does not sucker 
