834 ARBORETUM ET FRUTICETUM BRITANNICUM. 
by the exudation of the sap and the admission of the weather, nu longer 
to throw up vigorous shoots, and it will decay in a few years. 
# 2. A. optonca‘ta Willd. The oblong-leaved Alder. 
den feattons Willd. Sp. Pl., 4. p. 335.; Baum., p. 20. 5 
N. Du Ham., 2. p. 215. 
Synonymes. A’\nus fol, oblong., &c., Bauh.; A. fol. ovato- 
lanceol., &c., Mzld. Dict. ed. 7. ; langliche Else, Ger. 
Engravings. Our fig. 1515. from a specimen in Sir W. J. 
ooker’s herbarium ; and fig, 1516. from a specimen in 
the Museum of the Jardin des Plantes. 
Spec. Char, Sc. Leaves elliptic, somewhat 
obtuse, glutinous ; axils 
of the veins naked on 
the under side.( Willd.) A 
large deciduous shrub or 
low tree. Hungary, Aus- 
tria,and Turkey. Height 
20 ft. to 30ft. Intro- 
duced in 1749. Flowers 
greenish ; March and 
April. Fruit brown ; ripe 
in October or November. 
Variety. 
x ¥ A. vu. 2 foliis ellip- 
, ticis Ait. A, pu- 
1515. a. oblongata. mila Lodd. Cat. 1516, A. oblongata. 
—The leaves are 
somewhat narrower than in the species. 
¥ 3. A.inca’na Willd. The hoary-leaved Alder. 
Identification. Willd. Sp..Pl., 4. p.335.; N. Du 
Ham., 2. p. 215. ; Hdss Anleitung, p. 190. 
Synonymes. B. A’\nus var. incana Lin. Sp. Pl. 1394. 5 
B. incana Lin. Suppl. ; B. viridis Vill. Dauph, 2. 
Bs 789. ; weisse Erle graue Else, or weisse Eller, 
rer. a 
Engravings. Wayne Abbild., t. 136.; and our jig. 
1517. 
Spec. Char., §c. Leaves oblong, acute, 
pubescent beneath ; axils of the veins 
naked, Stipules lanceolate. (Willd.) 
A deciduous tree. Lapland, Sweden, 
and Prussia; and on the hills in Aus- 
tria, Carniola, the Ukraine, Tyrol, and 
Switzerland; also in North America. 
Height 50 ft. to 70ft. Introduced in 
1780. Flowers greenish; March and 
April. Fruit brown; ripe in October. igiay Biadian. 
Varieties, 
£ A. i. 2 lacinidta Lodd. Cat. ed. 1836.— The leaves are slightly laci- 
niated. Horticultural Society’s Garden. 
¥A.i. 3 glaica, A. glaica Miche. N. Amer, Syly.; Bétula incana var. 
gladca dit, ; Black Alder, Amer.— The leaves are dark green above, 
and glaucous beneath ; the petioles reddish. This is one of the 
most beautiful trees of the genus, 
¥ Avi, 4 anguldta Ait.— Leaves green underneath, with the petioles 
also of a dark green. 
Other Varieties. A, americdna Lodd. Cat., and A. canadénsis Lodd. 
Cat., appear to belong to this species; but the plants in the Hackney ar- 
boretum are so small, that we have not been able to satisfy ourselves that 
they are sufficiently distinct to constitute even varieties, 
