excelsa. 
DXCLIN5A AMENTACEJE. Betula. 021 
B. acuminata. Ehrh. leitr. 6. p . Q8. 
B. lenta. Du Roi harbk. l.p. Q2. Wangh. amer. p.45. 
L 2 9 /!oS. 
Icon. Mich. arb. 2 . p. 13$. t. 2. Willd arb. t. 2 .f 5. 
In barren rocky woods and old fields : Canada to Pen- 
sylvania. T? • J une ’ July. v. v. From thirty to forty 
feet high. It is known by the name of White Birch 
or Old Field Birch . 
2 . B. foliis ovatis acutis serratis, petiolis pubescentibus pe- 
dunculo brevioribus, strobilorum squamis lobis latera- 
libus rotundatis. Willd. sp. pl. 4. p. 403. 
B. lutea Mich, arb. 2 . p 152. 
Icon. Mich. I. c. t. 5. Willd. arb . t. 2 . f. 2 . 
In low grounds : province of Maine, Hudson’s river. Jy . 
May, June. v. v . From seventy to eighty feet high 5 
generally called Yellow Birch. 
3 . B. foliis rhombeo-ovatis duplicato-serratis acutis subtus nigra, 
pubescentibus, basi integris, amentis femineis ovatis, 
squamis villosis, laciniis linearibus aequalibus. — Willd . 
sp. pl. 4. p . 464 , 
B, lanulosa. Mich.Jl. amer. 2. p. 181. 
B. rubra. Mich. arb. 2. p. 142. 
Icon. Mich, L c. t. 3. Willd arb t. 2 ,f 6. 
On the banks of rivers : New Jersey to Carolina. J? . 
May. v. v. About seventy feet high when full 
grown ; the wood very fine. It is generally called 
Red Birch. 
4. B. foliis ovatis acuminatis duplicato-serratis, venis subtus papyracea , 
hirsutis, petiolo glabro, amentis feminei» peduncula- 
tis nutantibus, squamis lobis lateralibus brevibus sub- 
orbiculatis.— Willd. sp. pl. 4. p. 404. 
B. papyrifera. Mich.Jl. amer. 2 . p. i 80. 
Icon. Mich. arb. 2 . p. 133. t 1 . Willd. arb. t. 2.f. 1 . 
In the forests of Canada to a great northern latitude, and 
as far south as the Hudson’s river f? . May, June. 
v. v. A large tree, highly useful to the natives for 
constructing their large portable canoes, from which 
circumstance it is known by the name of Canoe Birch . 
5. B. foliis cordato-ovatis argute serratis acuminatis, nervis lenta • 
subtus petiolisque pilosis, strobilorum squamis glabris, 
lobis obtusis aequalibus elevatu- venosis.— Willd. sp. 
pl. 4. 404. 
B. carpinifolia. Ehrh. leitr. 6. p. 99 . 
