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CHAP. CIII. SALICA‘CEE. PO’PULUS. 1649 
Propagation, §c. The trembling poplar in be propagated by cuttings, 
but not so readily as most other species. herever trees are found, they 
generally throw up suckers from which plants may be selected ; or cuttings of 
the roots may be made use of. In some situations, seedling trembling poplars 
are abundant in the woods ; and these are sometimes collected by the country 
people, and sold to the nurserymen. When it is intended to raise the trem- 
bling poplar from seed artificially, the seeds ought to be gathered as soon as 
they drop, and immediately sown on light, rich, moist soil, and covered with 
the same soil as slightly as possible, and shaded by branches, spray, leaves, or 
mats. The plants will come up at the end of four or five weeks, and will 
grow lin. or 2in. the first summer. In the future culture of the tree very 
little or no care is required, at least in Britain. On the Continent, and 
particularly in Belgium, it is very subject to the attacks of insects, and espe- 
cially to those of the larve of different kinds of moths, butterflies, and Ten- 
thredinida. These are collected in the beginning of summer, by order of the 
public authorities; and payments are made to the collectors in proportion to 
the quantity they bringin. The 7%pula junipérina L. lays its eggs in the 
leaves and leaf-stalks of this species; in consequence of which circumstance, 
red glandular substances, about the size of a pea, are produced: but the 
injury done by these is trifling, compared with that effected by other insects, 
which eat away the disk of the leaf. 
Statistics. Yn England, in the environs of London, at Kenwood, Hampstead, P. t. péndula, 8 years 
planted, is 20 ft. high, in sandy soil; at Syon, the species, 70 ft. high ; in the Isle of Jersey, in Saun- 
ders’s Nursery, 10 years planted, it is 40 ft. high, the diameter of the trunk 14in., and of the head 
44 ft.; in Staffordshire, at Trentham, 10 years planted, it is 30 ft. high ; in Yorkshire, at Castle Howard, 
it is 130 ft. high, the diameter of the trunk 33ft. In Scotland, in Renfrewshire, at Bothwell Castle, 
80 years planted, it is 73 ft. high, the diameter of the trunk is 4 ft., and of the head 117 ft.; in Banff- 
shire, at Gordon Castle, 84 ft. high, the diameter of the trunk 4 ft., and that of the space covered by 
the branches 60 ft.; in Forfarshire, at Courtachy Castle, 14 years planted, it is 40 ft. high ; in Perth- 
shire, at Taymouth, it is 80 ft. high, diameter of the trunk 2 ft. 3in., and of the head 20 ft. ; in Stirling- 
shire, at Callendar Park, 10 years planted, it is 30ft. high. In Ireland, in the Glasnevin Botanic 
Garden, 20 years planted, it is 30 ft. high ; in Galway, at Coole, it is 70 ft. high, and the diameter of 
the trunk is 2 ft. ; in Louth, at Oriel Temple, 40 years old, it is 72 ft. high. In Saxony, at Worlitz, 
60 years old, it is 40 ft. high, the diameter of the trunk 3ft. In Austria, at Vienna, at Briick on 
the Leytha, 40 years old, it is 48 ft. high, the diameter of the trunk 23 ft, and of the head 36 ft. 
In Bavaria, at Munich, in the English Garden, 30 years old, it is 40 ft. high, the diameter of the 
trunk 10in., and of the head 15 ft. In Russia, near St. Petersburg, 90 years old, it has a trunk 
1 ft. in diameter. In Italy, in Lombardy, at Monza, 24 years old, it is 70 ft. high, the diameter of the 
trunk 1} ft., and of the head 26 ft. 
Commercial Statistics. Plants are seldom propagated in the London nur- 
series; but, when they are to be found there, the price is similar to that of 
P. alba; and this is the case also on the Continent. : 
* 4, P. (v.) Tre’pipa Willd. The North American trembling-leaved 
Poplar, or American Aspen. 
Tientification. Willd, Sp. PL, 4. p. 803.; Pursh Fl. Amer. Sept., 2. p. 618.; Spreng. Syst. Veg., 2. 
Sgnomymnc. P. tremuldides Michzr. Fi. Bor. Amer.,2, p. 243., Michz. North Amer. Sylva., 2. p. 241. 
t. 99. f, 1., N. Du Ham., 2. p. 184. 
The Sexes. A plant of the female is in the London Horticultural Society's arboretum, where it 
flowered in pel, 1835, though only 5 ft. or 6 ft. high. The stigmas were 6 or 8. 
Engravings. N. Du Ham., 2. t. 53.; Michx. Arb., 3. t. 8. f.1.; Michx. North Amer. Sylva, 2. t. 99. 
' f. 1,3; and our jig. 1510. f 
Spec. Char., §c. Disk of leaf suborbiculate, except having an abruptly acumi- 
nate point, toothed, having two glands at its base on the upper surface, 
silky while young, afterwards glabrous. (Pursh.) Disk of leaf white, and 
silky on both surfaces when young; glabrous when adult. Petiole very 
long, not compressed. (Willd., from dried specimens.) Bud resinous. Pe- 
tiole compressed. Disk of leaf toothed with hooked teeth, ciliate. (Spreng.) 
Catkins silky. (Michaux, jun.) A tree, from 20 ft. to 30 ft. high; found in 
North America, in extensive swamps, from Canada to Carolina; and found, 
also, from Hudson’s Bay to the northward of the Great Slave Lake, as far 
as lat. 64°. It was introduced into Britain in 1812, and flowers in April. 
Its usual period of leafing, in England, is before that of P. trémula. There 
is a plant of this kind in the London Horticultural Society’s Garden, which, 
in 1834, after being eight years planted, was 12ft. high. On April 20. 1835, 
5P 2 
