LXVIII. i'ALICA^CE^ : Po'rULUS. 



829 



when they first un- 

 fold are smooth and 

 brilliant, 7 in. to 8 in. 

 long on \oung plants, 

 and as much in 

 breadth ; while on 

 trees 30 or 40 feet 

 high they are only 

 one fourth the size. 

 As an ornamental 

 tree, it forms a very 

 stately object ; but, from the brittleness of the branches, they 

 to be torn off by high winds. The wood is of little use either 

 England. Propagated by layers, as it strikes less freely from 

 most of the other species. 



1503. P. angulaU. 



are very 

 in Amer 

 cuttings 



liable 



ica or 



than 



^ 13. P. heterophy'lla L. The vaxio\i?,-shaped-\ea.\edi Poplar Tree. 



Identification. Lin. Sp. PI., 1464. ; Michx. Fl. Bor. Amer., 2. p. 244. ; Pursh Sept., 2. p. 619. 

 Si/no?i!/mfs. P. magna, foliis amplii, &c., Gron. I'iyg. 104. l.'S;. ; P. cordifdlia Burgsdorf, Lodd. 



Cat. edit. 1S36 ; P. argentea Michx. North Amer. bylva 2. p. 235. t. 97. ; Cotton Tree, Mickx. 



N. A.S. J I , 



The Sexes. Only the male is in British gardens. 



ngravings. Michx. North Amer. Sylva, 2. t 97. ; N. Du Ham., 2. t. 51. ; and our Jig. 1506. 



Spec. Char., Sfc. Shoot round, tomentose. Leaf, while young, tomentose ; 

 afterwards less so, or glabrous. Petiole but slightly compressed. Disk 

 roundish ovate, having a small sinus at the base, and being slightly auricled 

 there (or, as JNIichaux, jun., has expressed it, with the lobes of the base 

 lapped, so as to conceal the junction of the petiole), blunt at the tip, 

 toothed ; the teeth shallow, and having incurved points. Male flowers 

 polyandrous. Female flowers glabrous, situated distantly along the gla- 

 brous rachis, and upon long pedicels. (j\Iic/i.r.) A tree. New York to 

 Carolina, in swamps, and more particularly in the country of the Illinois, 

 and on the western rivers. Height 70 ft. to 80 ft. in America; 8ft. to 10 ft. 

 in England. Introduced in 1765. Flowers reddish. Decaying leaves 

 greenish yellow ; April and May. 



We have never seen plants of this species higher than 5 or 6 feet ; though 



a specimen tree in the IVIile End Nursery, and another at Syon, must have 



been planted more than 50 or 60 years ; and though it is said by Bosc to be a 



lofty tree in the neighbourhood of Paris. 



It is a very remarkable species, from the 



particular character of its leaves, which, 



though as large as, or larger than, those 



of P. angulata, and something resembling 



them in outline and in position on the 



branches, yet have nearly cylindrical foot- 

 stalks, and their disks hanging down on 



each side from the midrib in a flaccid 



manner, not observable in any other spe- 

 cies of the genus. The young branches 



and the annual shoots are round, instead 



of being angular, like those of P. angulata, 



P. canadensis, and P. monilifera. The 



leaves, while very young, are covered 



with a thick white down, which gradually 



disappears with age, till they at last 

 I become perfectly smooth above, and 

 , '^I'glitly downy beneath. Propagated by inarching on any of the varieties ot 

 1 P. nigra. If this species were grafted at the height of 30 or 40 feet on P. 

 , monilifera, it would form a very singular and beautiful drooping tree. 



1506. p. hetcroph^Ua. 



