LXVIII. SALICA‘CER!: PO’PULUS. ' 825 
Spec. Char., §e. 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. monilffera. The young buds are gummy. 
The catkins of the female are from 6 in. to Sin. long. (Miche.) 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 
poplarapproaches 
nearer to P. nigra 
than any other 
species ; and Mi- ‘ 
chaux, in 1840, 
expressed to us 
the same opinion, 
and in short that 
1499. P.(n.) canadénsis, it was difficult to 1500. P. canadénsis. 
distinguish them. , 
Propagated by cuttings of the young wood, about 1Sin. 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. monilffera. 
¥9. P. (2 N.) BETULIFO'LIA Pursh, The Birch-leaved Poplar. 
Identification. Pursh Fl. Amer. Sept., 2. p. 619.; Spreng. Syst. Veg., 2. p. 244. 
Synonymes. P. nigra Michz. Fl. Amer. Bor. 2. p. 244.; P. hudsénica Michx. Arb. 3. p. 293. t. 10. 
f..1., North Amer. Syl. 2. p. 230.3; P.hudsoniana Bosc, 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. 1501. 
Spec. Char., Sc. 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. 
(Michz.) 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-Jeaved tree, but in our opinion only a variety of P. 
nigra. M. Michaux, in 1840, acknowledged the proba-  iso1. p. (nj setulifulia. 
bility of this being the case. 
¥ 10. P.(?N.) moniLi’FERA Ait. The Necklace-bearing, or black Italian, 
Poplar. 
Identificatton. 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. tom 6. p. 400., Nouv. Cours 
@’ Agri. tom. 11. p. 407.; P. glanduldsa Meench Meth. p. 339.; P. carolinénsis Manch Weissenst. 
81., Burgsd. Anleit. 378.; P. nigra itdlica Lodd. Cat. edit. 1836; P. nigra americana Ibid.; P. 
