1640 ARBORETUM AND FRUTICETUM. PART III. 
perty ) it will not, like any resinous wood, readily take fire.’ (Smith in 
Eng. Fl, 
Varieties referable to one or other of the preceding kinds, most of them to 
P. alba. 
¥ P. a. 2 hibrida Bieb. F|.Taur. Cauc., 2. p.423., and Suppl., p. 633.; P. 
‘alba Bied.,l.c.; ? P. intermédia Mertens; P.a. crassifolia Mertens ; 
and P. grisea Lodd. Cat., 1836; appears to be intermediate between 
P. alba and P. (a.) canéscens. It is plentiful in the neighbourhood 
of streams in Tauria and Caucasus; whence it appears to have been 
introduced into Britain in 1816. There is a female plant of this 
kind in the Horticultural Society’s Garden, and young plants in 
Loddiges’s arboretum. 
¥ P.a.3acerifolia; P.acerifolia Lodd.Cat., ed. 1836 ; P, quercifolia Hort. ; 
P. palmata Hort.; is a very distinct variety of P. alba, with the 
leaves broad, and deeply lobed, like those of some kinds of A'cer. 
¥ P. a. 4 arembérgica, P. arembérgica Lodd. Cat., 1836, seems identical 
with P. (a.) acerifolia; but the plants in Loddiges’s collection, which 
were only received in 1835, are so small, that it is difficult to 
decide with certainty respecting them. Booth (Gard. Mag., xi. 
p- 207.) describes it as growing much more rapidly than the old variety. 
* P.a. 5 bélgica, P. bélgica Lodd. Cat., ed. 1836, is also a kind removed 
from the Continent in 1835; but the plants in Messrs. Loddiges’s 
collection are too small to admit of our stating anything more re- 
specting them, than that they are evidently a variety of P. alba; 
probably identical with P. a. acerifolia. 
+ P. a.6 cdndicans, P. candicans Lodd. Cat., ed. 1836, is a strong-growing 
variety of P. alba; probably also identical with P. acerifolia. This 
is the P. tomentésa of the Hawick Nursery, and the hoary poplar of 
the Edinburgh nurseries, where it is propagated by layers, which 
make shoots 6 ft. or 8 ft. long the first season. 
¥ P.a. 7 nivea, P. nivea Lodd. Cat., differs very little, if at all, from the 
preceding variety. 
¥ P. a. 8 egyptiaca Hort., P. a. pallida Hort., the Egyptian white poplar, 
is a much weaker-growing plant than any of the preceding varieties ; 
though we have received specimens of this kind from the Hawick 
Nursery, and seen a tree bearing this name in the Horticultural 
Society’s Garden, we can say very little about it. Messrs. Archibald 
Dickson and Son, of Hawick, state that it is unfit for planting for 
forest purposes. . 
Other Varieties. The late Professor Mertens of Bremen (as M. Fis- 
cher of Gottingen informed us in 1835) planted a number cf different 
sorts of poplar on the ramparts of Bremen; and, in 1816, specimens 
of these were sent to Sir J. E. Smith, which are now in the herbarium 
of the Linnzan Society. Of these specimens, the most remarkable is 
¥% P. a.9 pendula, P. a. var. gracilis ramis pendéntibus Mertens. — The specimens of this va- 
riety are of both sexes ; and we may presume, from the pendent shoots, that it would 
be a very desirable kind of poplar to have introduced, if it is not already in this country. 
There is a pendent-branched tree of P. alba in Lincoln’s Inn New Square, which might 
probably retain its drooping character, if propagated by cuttings or grafting. 
Description, §c. The white poplar, and its different varieties, form trees 
from 80 ft. to 100 ft. high, and upwards, generally with a clear trunk to a con- 
siderable height, and a spreading head, usually, in full-grown trees, but thinly 
clothed with foliage. The roots creep under the surface to a considerable 
distance from the tree, and send up suckers in abundance. The leaves of all 
the varieties are white underneath; those of P. (a.) canéscens least so; and 
those of P. a. nivea, and P. a. candicans, so in the greatest degree. The 
leaves of the largest-growing varieties of the abele tree, are deeply lobed and 
indented ; very dark above, and very white and downy beneath, with foot- 
stalks about lin. in length. The young shoots have a purplish tinge, and 
they are covered with a white down; but the bark of the trunk and of the 
