LXIX. BETULA‘CEE®: 4’LNUS. 835 
A. incana differs from the common alder, in the leaves being pointed, in the 
leaves and the young wood not being glutinous, in their hoary appearance, 
and in the absence of tufts of hair in the axils of the nerves of the leaves 
It forms a very handsome tree, will grow in either dry or moist soil, and well 
deserves a place in ornamental plantations. 
& 4, A. sERRULATA Willd. The saw- 
leaved Alder. 
Identification. Willd. Sp. Pl, 4. p.336.; Pursh 
Sept., 2. p. 623. ; Michx. N. Amer. Syl., 2. p. 113. 
Synonymes. Bétula serrulata Ait. Hort. Kew. 3. 
p. 888.; B.rugdsa Ehrh. Beytr. 3. p. 21.3 ? A. 
americana Lodd. Cat. ed. 1836; ? A. canadénsis 
Lodd. Cat. 1836; common Alder, Amer. ; Hazel- 
leaved Alder. 
Engravings. Wang. Amer., t. 29. f. 60. ; Michx. N. 
Amer. Syl., t. 75, f. 1.; and our fig. 1518. from a 
living specimen. 
Spec. Char., §c. Leaves obovate, acu- 
minate; veins and their axils hairy on 
the under side. Stipules elliptic, ob- 
tuse. (Willd.) A deciduous shrub, 
North America, in swamps and on 
river sides. Height 6 ft. to 10 ft, 
Introduced in 1769. Flowers greenish; — : 
March and April. Fruit brown ; ripe SY ll 
in October or November, \ 
Zi 
Its leaves are of a beautiful green, EQ sti g 
about 2 in. long ; oval, distinctly furrowed <2’ A Weg 
_on the surface, and doubly denticulated LLLP \\ ZB 
at the edge. The wood, when cut into, Vy 
is white ; but like that of all the alders, 
it becomes reddish when it comes in con- 
tact with the air. 
* 
1518. A. serrulata. 
2 5. A. unpDuLA‘ra Willd. The waved-leaved 
Alder. 
Identification. Willd. Sp. Pl, 4. p. 336.; Baum., p. 21.; Lodd 
Cat., ed. 1836. 
Synonymes. Bétula crispa Ait. Hort. Kew.3. p. 339.3 B. Anus 
var. crispa Micha. Fl. Bor. Amer. 2. p. 181.3; A. crispa Pursh 
Fl. Amer, Sept. 2. p. 623, N. Du Ham. 2. p. 216 
Engraving. Our jig. 1519. from a specimen ‘in the British 
useum. 
Spec. Char., §c. Leaves oblong, acute, rounded 
at the base; petioles and veins hairy on the 
under side; axils of the veins naked ; stipules 
ovate-oblong. (Willd.) A deciduous shrub. 
Canada, and on high mountains in sphagnout 
swamps in Pennsylvania. Height ? 10 tt. te 
15 ft. Introduced in 1782. Flowers greenish ; 
March and April. Fruit brown ; ripe in October . 
1519. A. undulata. 
£6. A. corpiro'L1a Lodd. The heart-leaved Alder. 
Identification. Lodd. Bot. Cab., t. 1231. 
ee Meee A. cordata Tenore Prod. 54., Boyne Dend. p. 153. . 
ravings. Bot. Cab., t. 1231.3 the plateof this species in Arb. Brit., Ist edit. vol. vii.; ando - 
ig. 1520. 
Spec. Char., §c. Leaves heart-shaped, acuminate, dark green and shining 
(Tenore.) A tree of similar magnitude to the common alder. Calabria 
and Naples, in woods. Height 15 ft. to 20ft. Introduced in 1820. 
Flowers greenish brown ; March and April, before the developement of the 
leaves. Fruit brown; ripe in October. 
3H 2 
