1688 ARBORETUM AND FRUTICETUM. PART IID, 
being glutinous, in their hoary appearance, and in the absence of tufts of hair 
in the axils of the nerves of the leaves. It was introduced into England 
in 1780, but has not been much cultivated. There are plants at,Messrs. 
Loddiges’s 30 ft. high. It formsa very handsome tree, and well deserves a 
place in ornamental plantations. 
Varieties. 
¥ A. i. 2 lacinidta Lodd. Cat., ed. 1836.—The leaves are slightly laciniated. 
There are trees in the Horticultural Society’s Garden, and at 
Messrs. Loddiges’s. 
* A.i. 3 glaica; A. glaica Miche. N. Amer. Sylv., Lodd. Cat., ed. 1836 ; 
Bétula incana var. glatica Ait.; Black Alder, Amer., has the leaves 
dark green above, and glaucous beneath : the petioles are reddish. 
According to Michaux, this forms a tree, in the United States, from 
18 ft. to 20 ft. high. This is one of the most beautiful kinds of the 
enus. 
iz ae 4 angulata Ait.—Leaves green underneath, with the petioles green. 
Other Varieties. A. americana Lodd. Cat., A. canadénsis Lodd. Cat., 
and A. rubra Lodd. Cat., appear to belong to this species ; but the plants 
in the Hackney arboretum are so small, that we have not been able to 
satisfy ourselves that they are sufficiently distinct to constitute varieties. 
2 4, A. seRRULA‘TA Willd. The saw-leaved Alder. 
Identification. Willd. Sp. P1., 4. p. 336.; Baum., p. 21.; N. Du Ham., 2. p. 216.; Pursh FL Amer. 
Sept., 2. p. 623.; Michx. N. Amer. Syl., 2. p. 113.; Lodd. Cat., ed. 1836. d 
Synonymes- Bétula serrulata dit. Hort. Kew., 3. p. 338.; B. rugdsa Hhrh. Beitr., 3. p. 21.3 Du 
Roi Harb. Baum., 1. p. 176.; Wang. Amer., p. 86.; ? A. americana Lodd. Cat., ed. 1836; ? A. 
canadénsis Lodd. Cat., 1836 ; common Alder, Amey. ; Hazel-leaved Alder. 
Engravings. Wang. Amer., t. 29. f. 60.; Abbott’s Insects, 2. t. 92. ; Michx. N. Amer. Syl., t. 75. 
f. 1. ; and our fig. 1544., on which are exhibited the larva, pupa, and perfect insect of the Noctua 
(Acronycta) hastilifera, Phale‘na hastulifera Abb. and Smith, the American alder dagger moth, 
which inhabits this tree. 
Spec. Char., §c. Leaves obovate, acuminate; veins and their axils hairy on the 
under side. Stipules elliptic, obtuse. (Willd. Sp. Pl., iv. p. 336.) A shrub, 
from 6 ft. to 10 ft. high; a native of North America, in swamps and on river 
sides. According to Michaux, it is frequent along the sides of brooks, but 
abounds most in places covered with stagnant water. Its leaves are of a 
beautiful green, about 2 in. long, oval, distinctly furrowed on the surface, 
and doubly denticulated at the edge. The wood, when cut into, is white ; 
