1676 ARBORETUM AND YFRUTICETUM. PART III. 
¥ 15. P. ca’npicans Ait. The whitish-leaved balsam-bearing, or Ontario, 
Poplar. 
Identification. Ait. Hort. Kew., ed. 1., 3. p. 406., ed. 2., 5. p. 397. ; Willd. Arb., 231,, Sp. Pl., 806. ; 
Michx. Arb.; North Amer, Sylva, 2. p. 239. t. 98. f. 2.; Pursh Fl. Amer. Sept., 2. p. 618. ; Spreng. 
Syst. Veg., 2. p. 244. 
Synonymes. P. macrophylla Lindl. in Encyc. of Plants, p. 840., and Lodd. Cat., 1836; P. latifolia 
Moench Meth., p. 338.; P. ontariénsis Desf. Hort. Par., and Lodd. Cat., 1836 ; P. cordata Lodd. Cat., 
1836; P. canadénsis Maench Weissenst., 81., but not of Michx. which is P. levigata Willd. ; Balm 
of Gilead Tree, Boston, North Amer.; Peuplier liard, Canada ; Peuplier 4 Feuilles vernissées, Fr. 
The Sexes. The male is in the London Horticultural Society’s Garden; the female is in the Duke 
of Wellington’s garden at Apsley House, London. 
ae ee Catesb. Car., 1. t. 34; Michx. Arb. ; Michx. North Amer, Sylva, 2. t. 98. f. 2. ; and our 
if. 5 
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 (Miche. jun., Pursh, Spreng.,and obs.) The disk of the 
leaf is thrice as large as that of P. balsamifera. (Miche. jun.) <A tree, 
attaining the height of 40 ft. or 50 ft., with a trunk 18in. or 20in. in 
diameter, in the states of Rhode Island, Massachusetts, and New Hamp- 
shire; flowering, with the balsam poplar, in March. It was introduced 
into England in 1772, and is frequent in gardens. 
Description, §c. The Ontario poplar bears a close general resemblance to 
the balsam poplar: it has the rigid fastigiate habit of that tree, its fine fra- 
grance, 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 
substance as those of P. balsamifera ; and 
the leaves are of the same fine yellow colour )<—"~\, 
in spring, and, like those of the balsam poplar, \< > 
preserve, at all stages of their growth, the SZ 
same shape. The foliage, when mature, is 
tufted, and of a dark green; the disposition 
of the branches is somewhat rigid and irregu- 
lar; which last circumstance prevents the 
foliage from massing well together, and gives ls 
the tree rather an inelegant appearance. The 
trunk is covered with a smooth greenish 
bark, which becomes darker with age; the 
wood is soft; and, like that of the balsam poplar, is chiefly valuable for 
producing potash. Michaux never found the tree in forests in America, 
nor was he able to discover where it was indigenous; but he found it 
growing commonly before houses, both in the towns and country. Pursh 
mentions New England as the place where he had seen it in a living state. In 
British gardens, it has very frequently been confounded with the balsam 
poplar; and the same thing, Bose informs us, often happens in France. Bosc 
strongly recommends this tree for its shade, and the fragrance with which 
it perfumes the air in spring. It is readily propagated by cuttings or suckers, 
but will not attain a large size unless on rich soil near water ; though, as the 
roots creep along the surface, the soil need not be deep. 
Statistics. In England, in Buckinghamshire, at Temple House, 40 years planted, it is 70 ft. high ; 
the diameter of the trunk 2ft., and of the head 30 ft. ; in Durham, at Southend, 7 years planted, it 
is 20 ft. high; in Hertfordshire, at Cheshunt, 18 years planted, it is 45ft. high ; in Nottingham- 
shire, at Clumber Park, 10 years planted, it is 48 ft. high ; in Warwickshire, at Whitley Abbey, 
7 years planted, it is 24 ft. high. In Scotland, near Edinburgh, at the Experimental Garden, Inver- 
leith, 9 years planted, it is 23ft. high ; in Fifeshire, at Danibristle Park, 9 years planted, it is 23 ft. 
high ; in Stirlingshire, at Callender Park, 16 years planted, it is 70 ft. high In Ireland, at Dublin, 
in the Glasnevin Botanic Garden, 30 years planted, it is 30 ft. high. In Germany, at Vienna, in 
the garden of Baron Loudon, 30 years old, it is 24ft. high. Price of plants as in P. balsamffera, 
