Salicinee— Populus. 419 
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 cdndicuns, syn. P. Ontariénsis, 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 macrophylla and cordifolia. 
6. P. monilifera, syn. P. Acladésca, P. Canadénsis, ete. 
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. anguldta. 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 muoderate-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. 
Orpen CX._CONIFERZ. 
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 moncecious or dicecious, destitute of 
perianth : males in catkins, sometimes conoid, with one stamen 
BRE 2 
