1688 



ARBORETUM AND FRUTICETUM. 



PART III. 



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 30ft. high. It forms a very handsome tree, and well deserves a 

 place in ornamental plantations. 



Varieties. 



% A. i. 2 larinidta Lodd. Cat.,ed. 1836. The leaves are slightly laciniated. 

 There are trees in the Horticultural Society's Garden, and at 

 Messrs. Loddiges's. 



*t A. . 3 glauca ; A. glauca Michx. N. Amer. Sylv. y Lodd. Cat. y ed. 1836 ; 

 jBetula incana var. glauca Ait. ; Black Alder, Amcr. y 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 

 18ft. to 20 ft. high. This is one of the most beautiful kinds of the 

 genus. 



A. i. 4? anguldta Ait. Leaves green underneath, with the petioles green. 



Other Varieties. A. americdna Lodd. Cat., A. canadensis 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. 



a 4. A. SERRULA N TA Willd. The saw-leaved Alder. 



Identification. Willd. Sp. PL, 4. p. 336. ; Baum., p. 21. ; N. Du Ham., 2. p. 216. ; Pursh FL Atner. 



Sept, 2. p. 623. ; Michx. N. Amer. SyL, 2. p. 113. ; Lodd. Cat, ed. 1836. 

 Synonymes. J?tula serrulata Ait. Hort. Kew., 3. p. 338. ; B. rugbsa Ehrh. Beitr., 3. p. 21 .; Du 



Rot Harb. Baum., 1. p. 176. ; Wang. Amer., p. 86. ; ? A. americana Lodd. Cat., ed. 1836 ; ? A. 



canad6nsis Lodd. Cat., 1836 ; common Alder, Amer. ; 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 out fig. 1544. , on which are exhibited the larva, pupa, and perfect insect of the JVoctua 



(Acronycta) hastilifera, Phalae N 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. y iv. p. 336.) A shrub, 



15U 



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, ia white ; 



