CHAP. CIV. BETULA'CER. BE/TULA. 1707 
tions that the leaves of B. nana vary exceedingly ; in the marshes of 
Siberia, especially near Lake Baikal, and in Lapland and the aretic 
regions, they are small, and not an inch in length; but in Ingria, and 
the alpine rocky situations of Dahuria, they are large, and frequently 
broader than they are long. 
% 6. B. cLanpuLo’sa Michr. The glandular-dranched Birch. 
Identification, Michx. F1. Bor. Amer., 2. p. 180. ; Willd. Sp. Pl., 4. p. 466.; Pursh Fl, Amer. Sept., 
2. p. 622.; N. Du Ham., 3. p. 208. 
Spec. Char., &c. Branches beset with glandular dots, glabrous. Leaves obovate, serrate, quite entire 
at the base, glabrous, almost sessile. Female catkins oblong ; scales half 3-cleft. Seeds round, 
with narrow margins. (Willd. Sp. Pl., iv. p. 456.) A handsome little shrub, not above 2 ft. high ; 
found in Canada, about Hudson's Bay, and on the borders of lakes on the high mountains of New 
Jersey and Pennsylvania ; flowering in May.(Pursh.) It seems to correspond, in America, with 
the B. nana of Europe, and is probably only a variety of that species. It is not yet introduced. 
Leaves large. Natives of North America. 
* 7. B. (a.) poputiro'tia Ait. The Poplar-leaved Birch 
Identification. Ait. Hort. Kew., 3. p. 336.; Willd. Sp. Pl., 4. p. 463. ; Baum., p. 55.; N. Du Ham., 
3. p. 204.; Du Roi Harb. Baum., 1. p. 144.; Marshal, p. 36.; Pursh Fl. Amer. Sept., vol. 2. 
p. 620.; Michx. N. Amer. Syl., vol. 2. p. 97. 
Synonymes. B. acuminata Ehrh. Beit., 6. p.98.; B. lenta Du Roi Harb. Baum., ed. 1., p. 92., 
Wang. Beit., p. 45.; white Birch and Oldfield Birch, Amer. 
Engravings. Michx. Arb., 2. p. 139. t. 2. ; Willd. Baum., t.1. f. 5.; Michx. N. Amer. Syl., vol. 2. 
t. 71.; and our fig. 1560. 
Spec. Char., §c. Leaves deltoid, much acuminated, unequally serrated, quite 
smooth. Scales of the strobiles having roundish side lobes. Petioles 
glabrous. (Willd. Sp. Pl., iv. p. 463.) A tree, in every respect closely 
resembling B. alba, but growing with less vigour, and not attaining so large 
a size as that species. A native of North America. 
Varieties. 
* B. (a.) p. 2 laciniata, B. \aciniata Lodd. Cat., ed. 1836, has large, 
smooth, shining, deeply cut leaves, and appears to us to belong to 
B. (a.) populifolia, rather than to B. alba. 
*B. (a) p. 3 péndula, B. péndula Lodd. Cat., ed. 1836, has the spray 
drooping, like that of the weeping variety of the common birch; but 
whether equally distinct or not, we have been unable to determine, 
from the very small size of the plants in the London collections. 
Description. The poplar-leaved birch, according to Pursh, is a tree from 
30ft. to 40 ft. high ; but, according to Michaux, 
it only attains this height in favourable soils 
and situations. On trees that are fully grown, 
the branches are numerous, slender, and droop- 
ing. The leaves are smooth on both surfaces, 
heart-shaped at the base, very acuminate, and 
doubly and irregularly toothed. The petioles 
are slightly twisted; and the leaves are thus 
rendered more tremulous than those of trees 
on which this disposition is not observed. The 
buds, a few days after their developement, are 
slightly coated with a yellowish odoriferous 
substance, like those of B. alba. The trunk of 
this species is clothed in a bark of as pure a 
white as that of B. papyracea and B. alba; 
but its epidermis, when separated from the 
cellular integument, is capable of being divided, 
like that of B. nigra and B. excélsa, into thin 
sheets, which constitutes an essential difference. aft 
(Miche. N. Amer. Syl., ii. p: 98.) The tree “jy Q2 
is indigenous to barren rocky woods and old ed 
fields, from Canada to Pennsylvania. It is 
rare in Virginia, and does not exist in the other southern states, It is 
most frequently found in places scantily furnished with wood, where the 
