SalicinciZ Populus. 4 1 9 



base, serrate margin, and paler reticulated under-surface. The 

 buds are covered with a fragrant resin, whence the specific 

 name. This species is much subject to canker in some soils. 

 P. suaveolens is a Siberian form of this species, and there is a 

 variety called cdndicans, syn. P. Ontariensis, Balm of Gilead 

 Poplar, in which the leaves are broader and cordate at the 

 base. This again is found in nurseries under the names 

 of mdcrophylla and cordifolia. 



6. P. monilifera, syn. P. Acladesca, P. Canadensis, etc. 

 Necklace Poplar, Cotton Wood. A tall tree with the young 

 branches slightly angular, and broadly deltoid glabrous shining 

 serrate leaves with spreading prominent nerves, rounded or 

 slightly cordate at the base. The female catkins are very long 

 and pendulous, which suggested the specific name. A native 

 of North America. 



7. P. angulata. Carolina Poplar. This large tree is 

 remarkable for its ample ovate-cordate or deltoid entire or 

 obtusely serrate glabrous bright green leaves, which on 

 vigorous trees are from 6 to 9 inches long, and proportionately 

 broad. The branches are angular or almost winged. A native 

 of North America, and one of the most ornamental and desirable 

 of the genus. 



8. P. grandidentata. A moderate-sized tree with ovate- 

 orbicular coarsely sinuately toothed leaves clothed with a 

 dense white pubescence when young. A weeping variety of 

 this is more frequently seen than the erect one. North 

 America. 



There are several other species or forms occasionally seen in 

 gardens, but none of them superior to those enumerated. 



ORDER CX. CONIFERJE. 



Trees or shrubs, generally resinous, and for the greater part 

 evergreen. Wood destitute of medullary rays ; that is to say, a 

 transverse section does not show the lines from the centre to 

 the circumference so conspicuous especially in the young wood 

 of most exogenous plants. Leaves alternate, opposite, or fas- 

 cicled in a membranous sheath, often narrow, needle-like 

 and rigid, or reduced to dense imbricating scales, rarely with a 

 flattened limb. Flowers monoecious or dioecious, destitute of 

 perianth : males in catkins, sometimes conoid, with one stamen 



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