200 
THE DICTIONARY OF GARDENING, ‘ 
Populus—continued. 
pale, with rows of black, bristly warts. The larve, 
when touched, emit an ill-smelling, milky fluid. The 
pupæ are suspentled from the leaves by the tail, and are 
coloured like the larvæ. The larvæ feed in groups on the 
leaves, gnawing them into holes, so that only the network 
of veins is left. L. Tremulæ is a nearly allied species 
common in some localities. It agrees with L. Populi, 
except in being slightly smaller and greenish-blue, with 
the wing-cases coarsely pitted, more yellowish-red, and 
not tipped with black; and the antennæ are tipped with 
brown. Another nearly allied insect, of similar habit, 
is Phratora vitelline. The same remedies may be em- 
ployed against all the three species. See Phratora. 
Numerous species of Sawflies (chiefly of the genus 
Nematus) feed, as larve, on Poplars, and most of these 
feed on Willows also; but none of them have been 
observed to do damage enough to require special 
measures to be taken against them. The same may be 
said of those Lepidoptera that feed, as larve, on the 
leaves of Poplars. 
picking, or mere shaking them off the branches, is 
usually sufficient. Further information in regard to 
several of them is —— —— —— following heads: 
Lackey Moth, Lip , Sphingids 
(Poplar Hawk Moth), * Tussock Moths; ; though, under 
several of these heads, Poplars are not ‘specially men- 
tioned in connection with the insects, which, ın these 
instances, feed on many kinds of plants. In addition 
to these, a very large number of moths live on Poplars, 
but do not eall for mention individually. 
Poplars, including among them the Aspen, bear galls 
of various forms. Among the commonest of these are 
the hard, pea-like swellings on the leaf-stalks, formed 
by a midge (Diplosis Tremule) ; the rather conical, hollow 
galls on leaf-stalks, tenanted by Aphides (Pemphigus 
bursarius); the curious, spirally-twisted leaf-stalk galls 
of another kind of Aphides (Pemphigus spirothece) ; and 
the mite galls of Aspens, which vary in size from the 
galls of Heliaczeus Populi (about the size of pin-heads, 
at the base of the leaf-blade) to those of Batoneus 
Populi, which form masses, up to 3in. in diameter, = 
the beatae twigs or the trunk—fleshy, and green or red 
when fresh, but becoming hard, dry, and friable. These 
genus Phytoptus (see Mites), though the galls have 
received special names. Galls of all kinds do compara- 
tively little harm to the trees, except rendering them 
unsightly. They should be cut off and destroyed, if it 
% desired to free the trees from them. 
P. alba p (wiiee A Abele; White Poplar. A, catkins 2in. to 4in. 
—— March and April. Z. on the branches lin. 
: broadly Svate-cordate, sinuate bed, glabrous in age; 
— —— very short, slender, compressed ; leaves on the suckers, 
which are numerous, de! deltoid-ovate, lobed and toothed, Zin, toim 
in diameter. hes spreading ; buds cottony. h. 60ft. to 
100ft. Northern hemisphere (Britain). The wood of this tree 
is white in colour, light, and useful, but does not burn easily. 
(Sy. En. B. 1299.) 
P. a. —— ge s).* A — — —— or 
idal habit cow 
oe. (G. C: n. s. Su er SAIA — 
—— —— Grey Poplar. /. of the branches hoa 
rous; those of the suckers, angled and toothed 
The wood « this variety is said to be superior to that of the type. 
See Fig. (Sy. En. B. 1300.) 
P. angulata (angular). A synonym of P., monilifera, 
balsamifera Bey (haiam bearing)” Balm of Gilead; Balsam 
Poplar ; Tacamahac. 1. ovate, gradually tapering, and ted, 
ona moth on ol kd why el al 
d ; bu copio 
with fragrant resin. A. Toft. I North pros. vy ikoz. — 
Bb. St ee l. broader, and more or less heart- 
— petioles usually hairy. SYN. P. macro- 
P. b. laurifolia 
Cara eaei, l. oval, ral, oblong, and — 
— ones (and ranch s) — lose ‘Siberia. Saw: 
4 po 
If any remedy is required, hand- | 
mite-galls are, in reality, the work of mites of the | 
Populus—continued. 
P. b. suaveolens (sweet-smelling). l. broadly elliptic, acuminate, 
obtuse, toothed, slightly pubescent on the nerves and petioles. 
Rocky *Mountains. 
P. b. viminalis (twiggy). 
elongated, slender. s 
P. canadensis (Canadian). A synonym of P. monilifera. i 
P. c. aurea (golden). A synonym of P. monilifera aurea. z 
P. dilatata (dilated). A synonym of P. nigra pyramidalis. 
P. fastigiata (pyramidal). A synonym of P. nigra pyramidalis. — 
P. græca (Grecian). A synonym of P, tremuloides. 
P, grandidentata (large-toothed). J, male catkins 3in. to 4in. 
ong tem females lin. to 2in. long. March. 7. roundish- ovale. 
large and irregular, sinuate teeth, when young 2in. to din, 
long, densely covered with white silky wool, at length smooth on 
sides, lin. to 3in. long. Branches and branchlets cylin- 
drical ; buds pubescent, sometimes — glabrous. h. 60ft. 
North’ America, 1772. (E. T. S. M. e d. ii, 278.) Of this species 
there is a weeping variety nayi in cultivation. 
x long-lanceolate. Branches angular, 
* 
G. 253. PORTION OF BRANCH AND MALE CATKIN OF POPULUS 
ALBA CANESCENS. 
— male catkins thick, m 
, loose. March, l. bin. to 
‘or roundish-ovate, —— 
* resin ae urel- 
— (La leaved). A synonym of P. balsamifera 
P. macrophylla fP 
* Piet i of Lindley. A- synonym o 
P. monilifera ).* Necklace Poplar. l on young plants 
gon —— — Tin. w 8in. —— and wide; ; thosa a 
5 d 
pie pest —— Bae one-fourth that size, and commonly wi 
crenate-serrate, or with obtuse, cartilaginous 
teeth. Branches acu tely — . 80ft. or more. 
Topig America, 1738. SYNS. £ — ** canadensis. 
. m., aurea (golden). A v , ornamental tree, only 
differing from the ty a f the 
fenten tre ae ype in ene dele i golden-yellow tint o 
* 
pie ak ua tee o, f., male catkins 2in. to 3in. long, 
e uncle curved in 
—— April. l lin. to ĝin. ggi bard aay deltoid, or sub- 
orbicular, os silky beneath — the angles rounded, acuminate ; , 
young ones si and. ciliate ; ioles slender, com- 
— — come ; branchlets thesen when 
oung, and, as well as the the highly viscous 
Europe, 
growth and shor ——— ‘the wood is light, and is much 
« 
owish. 
The Black poplar ts of rapid - 
