1640 ARBORETUM AND FRUT1CETUM. PART III. 



pert* that it will not, like anv resinous wood, readily take fire." (Smith in 

 Eng. Fl.) 



. s referable to one or other of the preceding kinds, most of them to 



J '.alba. 



! P, a. 2 hi/brida Bieb. Fl.Tanr. Cane., 2. p. 4*23., and Suppl., p. 633.; P. 

 alba liu-b., 1. e. ; f P. intermedia Merina ; P. a. crassifdUa Mertens; 

 and P. grisea Lodd. Cat., 1836; appears to be intermediate between 

 /'. alba and P. (a.) canescens. It is plentiful in the neighbourhood 

 of streams in Tanria and Caucasus; whence it appears to have been 

 introduced into Britain in 1810. There is a female plant of this 

 kind in the Horticultural Society's Garden, and young plants in 

 Loddiges's arboretum. 



1 P.a. 3 ocerifoHa ; P. acerifolia Lodd. Cat., ed. 1836 ; P. r/uercifolia Hurt. ; 



P. palmata Hart.; is a very distinct variety of P. alba, with the 

 leaves broad, and deeply lobed, like those of some kinds of ^ v cer. 



t P. a. 4 arembergica, P. arembergica 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. 



t P. a. o belgica, P. belgica 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. 



2 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. tomentosa of the Hawick Nursery, and the hoary poplar of 

 the Edinburgh nurseries, where it is propagated by layers, which 

 make shoots 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 cegi/ptiaea 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 of 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 Liona?an Society. Of these specimens, the most remarkable is 



\ V. it. 9 /unz/it///, /'. a. var. gracilis riimis pendentibus Mertens. — The specimens of this va- 

 riety arc of both MXei ; and we may presume, from the pendent shoots, that it would 

 he | very desirable kind Of poplar to have introduced, if it is not already in this country. 

 '] bare ia a pendent-branched tree of /'. alba in Lincoln's Inn New Square, which might 



probably retain it^ drooping character, if propagated by cuttings or grafting. 



Description, SfC. The white poplar, and its different varieties, form trees 



from HO It. to 100 ft. high. and upwards, generally with a clear trunk to a con- 



rable height, and a spreading head, usually, in full-grown trees, but thinly 



clothed with Cottage. 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.) canescens least so; and 



thoM of /'. a. nivea, and /'. a. candicans, so in the greatest degree. The 



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- 



OUt I in. in length. '1'h'' .young shoots have a purplish tinge, and 



OVered with a white down ; but the bark of the trunk and of the 



