LXIX. BETULA‘CEE: 4/LNUS. 831 
into leaf ; its foliage is of a rich gamboge yellow, and so fragrant as in moist 
evenings to perfume the surrounding air. The tree is remarkably hardy, but, 
unless in the vicinity of water, it seldom attains a large size in England, or is 
of great duration. Readily propagated by suckers, which it sends up in abun- 
dance ; or by cuttings, which, however, do not strike so readily as those of the 
poplars belonging to P. nigra. 
¥ 15. P. ca’npicans Ait. The whitish-leaved Balsam-bearing, or Ontario, 
Poplar. 
of Wellington’s garden at Apsley House, London. : 
Engravings, Michx. North Amer. Sylva, 2. t. 98. f. 2.5; and our,fig. 1511. 
Spec. Char., §c. Shoot round. Bud very gummy. Stipules gummy. Pe- 
tiole compressed in its upper part, hairy in many instances. Disk of leaf 
heart-shaped at the base, ovate, acuminate; serrated with blunt unequal 
teeth; 3-nerved; deep green on the upper surface, whitish on the under 
one, on which the veins appear reticulate. Inflorescence similar to that of 
P. balsamifera, and the disk of the leaf thrice as large as in that species. 
(Michz.) Atree. North America, in the states of Rhode Island, Massa- 
chusetts, and New Hampshire. Height 50 ft. to 60ft. Introduced in 
1772. Flowers purplish ; March. Decaying leaves brownish. 
The Ontario poplar bears a close general 
resemblance to the balsam peat : it has the 
rigid fastigiate habit of that tree, its fine 
fragrance, and its property of throwing up 
numerous suckers ; but it differs from it, in 
having very large heart-shaped leaves, and in 
attaining a larger size, both in its native 
country, and in British gardens. The buds 
are covered with the same balsamic sub- 
stance as those of P. balsamifera; and the 
leaves are of the same fine yellow colour in 
spring, though they come out a fortnight 
later. Like those of the balsam poplar, they 
preserve, at all stages of their growth, the 
same shape. Readily propagated by cuttings b 
or suckers, but the tree will not attain a 1511. P. candicans. 
large size unless on rich soil near water; 
though, as the roots creep along the surface, the soil need not be deep. 
‘ Orpen LXJX. BETULA'CE. 
Orv. CHAR. Flowers hermaphrodite, or unisexual. Perianth free, 4—5 lobed. 
Stamens 4—12. Ovarium solitary. Stigmas 2, distinct. Fruit indehiscent, 
2-celled, compressed, sometimes expanded into wings at the sides. Seeds 
solitary in the cells, pendulous. Albumen none. (G, Don.) 
Leaves simple, alternate, stipulate, deciduous ; entire or serrated. Flo-vers 
in terminal catkins. — Trees deciduous; natives of Europe, Asia, and North 
America. Propagated by seeds or layers. 
The genera are two, which are thus contra-distinguished : — 
A‘tnus Tourn. Female catkins cylindrical ; seeds furnished with a membrane 
on each side. : 
Be’tuta Tourn. Female catkins oval, borne on a branchy peduncle; seeds 
not bordered with membranes. 
