LXVIII. SALICA V CE#: : PO'PULUS. 



825 



1499. P. (n.) canadensis. 



1500. P. canadensis. 



Spec. Char., $c. Young branches angled. Petiole compressed. Disk of leaf 

 roundish ovate, deltoid, acuminate, subcordate at the base, where there are 

 glands, serrated with unequal teeth, glabrous. The branches are angular, 

 and the angles form whitish lines, which persist even in the adult age of the 

 tree. The trunk is furrowed, even in old age ; less so than that of P. an- 

 gulata, more so than that of P. monilifera. The young buds are gummy. 

 The catkins of the female are from 6 in. to 8 in. long. (Jkfc&r.) A large 

 tree. North America, in high rocky places between Canada and Virginia, 

 and about the western lakes. Height 70 ft. to 80 ft. Introduced in 1769. 

 Flowers red ; April and May. Seeds ripe in June. Decaying leaves yellow. 



In Britain, the Canadian poplar used to be very commonly propagated 

 in nurseries, and extensively introduced into plantations ; but, within the last 



30 years, the black 



Italian poplar (P. 



monilifera) has 



been substituted 



for it. Bosc says 



that the Canadian 



poplar approaches 



nearer to P. nigra 



than any other 



species ; and Mi- 



chaux, in 1840, 



expressed to us 



the same opinion, 



and in short that 



it was difficult to 



distinguish them. 



Propagated by cuttings of the young wood, about 18 in. long, put in during 

 autumn. The first shoots produced from these cuttings are always curved 

 at the lower extremity, though in a few years this curvature entirely disap- 

 pears. The same thing takes place with the cuttings of P. monilifera. 

 *t 9. P. (? N.) ^ETULIFO'LIA Pursh. The Birch-leaved Poplar. 



Identification. Pursh Fl. Amer. Sept., 2. p. 619. ; Spreng. Syst Veg., 2. p. 244. 



Synonymes. P. nlgra Michx. Fl. Amer. Bar. 2. p. 244. ; P. hudsonica Michx. Arb. 3. p. 293. t. 10. 



f. 1., North Amer. Syl. 2. p. 230. ; P. hudsoniana Hose, and Lodd. Cat. ed. 1836; American black 



Poplar, Amer. ; Peuplier de la Baie d' Hudson, Fr. 



The Sexes. It is uncertain whether it is the male or female plant that is in European collections. 

 Engravings. Michx. Arb., 3. t. 10. f. 1. ; Michx. N. Amer. Syl., 2. t. 96. f. 1. ; and our fig. 1601. 



Spec. Char., fyc. Young branches yellow. Branchlets 

 hairy when young. Petioles yellow, and also hairy 

 when young. Disk of leaf rhomboid, but much acumi- 

 nated ; toothed in every part of the edge ; hairy on the 

 under surface when young, but afterwards glabrous. 

 The catkins are 4 in. to 5 in. long, and destitute of the 

 hairs which surround those of several other species. 

 (Michx.) A tree, found by Michaux on the banks of 

 the river Hudson, a little above Albany; and by 

 Pursh about Lake Ontario. Height 30 ft. to 40 ft. 

 Introduced in ? 1780. Flowers ?. 



Tolerably distinct; and forming a small, neat, deep- 

 green-leaved tree, but in our opinion only a variety of P. 

 nigra. M. Michaux, in 1840, acknowledged the proba- 

 bility of this being the case. 



* 10. P. (? N.) MONILI'FERA Ait. The Necklace-bearing, or black Italian, 



Poplar. 



Identification. Ait. Hort. Kew., ed. 1., 3. p. 406. ; Pursh Fl. Amer. Sept., 2. p. 618. 



Synonymes. P. virginiana Lin., Desf. Hort. Par., Dum. Bot. Cult, torn 6. p. 400., Nouv. Cours 



d'Agri. torn. 11. p. 407. ; P. glandulbsa Mcench Meth. p. 339. ; P. carolinensis Mcench Weissenst. 



81., Burgsd. Anleit. 378. ; P. nlgra italica Lodd. Cat. edit. 1836 ; P. nlgra americSna Ibid. ; P. 



1501 . P . (n>) ietu iifoiia. 



