81 



2049. S. viminalis, L. (Osier Willow.) 

 Introduced. New Edinburgh. 



POPULUS L. Poplar. 



2053. P. tremuloides, Michx. (American Aspen.) 



A small tree with white bark. One of the first trees to expand its 

 flowers in the spring. The young leaves glabrous, and of a delicate 

 yellowish green. Ap. 3. (B.) 



2054. P. orandidentata, Michx. (Large-toothed Aspen.) 



A rather larger tree than the last, with smooth green bark and 

 having the young leaves densely covered with white silky hairs, 

 afterwards almost smooth, roundish-ovate, with large and irregu- 

 lar teeth. May 1. (B.) 



2055. P. balsamifera, L. (Balsam Poplar. Balm of Gilead.) 



A large, handsome tree, bearing heart-shaped leaves, and large buds 

 covered with an aromatic resin. Petioles round, capsules 2-valved. 

 Ap. 4. (B.) Of the var. atndicans, Gray, Dr. Gray (Manual 6th 

 Edn., 1890, p. 487,) says. " Lea res broader and more or less 

 heart-shaped; petiole commonly hairy Common in cultivation, 

 but rare or unknown in a wild state ;" But Prof. Macoun says 

 (Macoun Cat. VI, p. 45), that this variety seems to be the prevail- 

 ing form in Ontario. 



2058. P. monilipera, Aiton. (Cottonwood.) 



A grand tree growing on islands or by river-sigles, sometimes over 

 100 feet high, easily distinguished from the last by the elongated, 

 flattened petioles, and the necklace-like fruiting catkins of 3-4- 

 valved, capsules. May 2. 



P. dilatata, Ait. (Lombardy Poplar.) 



Introduced. A tall stiff tree of very rapid growth, largely cultivated 

 in some parts for "ornament." 



P. alba, L. (Silver Abele. White Poplar.) 



Introduced. A handsome tree, but troublesome from its habit of 

 spreading from the roots. The far more beautiful P. Botteana, 

 from Eastern Europe, has not this habit, but is also, for a poplar, 

 exceptionally difficult to propagate from cuttings. 



