32 The Ottawa Naturalist. [May- 



are perpendicular and long, the terminal twigs having a slight 

 inward curve. When blown by the wind the whole tree sways 

 with a graceful feathery effect. Perhaps the best known of these 

 poplars are the ones that can be seen from the Plaza in Major 

 Hill Park. They overlook the canal, and from their position 

 show to good effect, and form a picturesque sky-line. There are 

 many other Lombardy Poplars throughout the city, and their 

 number might well be increased, for this is a handsome tree, 

 holding its leaves late into the autumn. 



The Balsam Poplar, P. balsamifera, is a native species, and 

 holds its own in the city, although it appears to be rarely trans- 

 planted to the street line, but grows in gardens or in neglected 

 lots. In some cities it is recommended where there is much coal 

 smoke. It is a large, handsome tree, with several shades of 

 yellow or greenish-yellow to brown on the large limbs. 



The Cottonwood, P. monilijera or deltoides, grows to a large 

 size and is fairly common. One great objection to this poplar is 

 the enormous quantity of cottony stuff that falls for two or three 

 weeks in the early part of the summer, and is carried everywhere 

 by the wind. 



The Abele, or Silver or White Poplar, P. alba, probably 

 also grows about the city, and may be recommended where 

 there is plenty of space. The peculiar white-tomentose matter 

 on the under surface of the leaves is characteristic, and the 

 peculiar mingling of green and white makes this tree a very 

 effective ornamental one. This beautiful silveriness of the under 

 surface is rather heightened in the twilight. One great dis- 

 advantage of this tree is the numerous suckers it produces. 



Juglandace^e. 



The Butternut, Juglans cinerea, grows commonly all around 

 Ottawa, and there are probably some growing within the city 

 limits. When in the open its huge branches spread out almost 

 horizontally. Its terminal twigs are large, and its leaves are 

 late in coming out and fall early. Nevertheless, the large 

 compound pinnate leaves give a very handsome effect, and the 

 tree is well worthy of cultivation where there is plenty of space. 



The Walnut, /. nigra, deserves to be planted more commonly 

 around the city. The branches are much more upright or ascend- 

 ing than the butternut. The bark is darker in color, and the 

 leaves are quite smooth above. The only tree I know of in the 

 city is situated well in from the street line at the south-west 

 corner of O'Connor and Somerset Sts. 



The Hickory, sub-family Carya, is mentioned more for the 

 wish to see it than the fact that it exists here. Carya alba or 

 Hicoria ovate, the shell-bark hickory, is the most important and 



