DICLINIA AMENTACE^. Betula. 



B. acuminata. Ehrh. leilr. Q. p. g8. 



B. lenta. Du Roi harhk. I. p. Ql. Wangh. amer. p. 45. 



t.2Q.f:38. 

 Icon. Mich. arb. 2. p. 139. t. 2. Willd. arb. t. 2./ 5. 

 In barren rocky vood^ and old fields : Canada to Pen- 



sylvania. 1^ . June, July. v. v. From thirty to forty 



teet high. ' It is known by the name of White Birch 



or Old Field Birch. 



2. B. foliis ovatis acutis serratis, petiolis pubescentibns pe- 



duncuio brevioribus, strobilorum squamis lobis latera- 



libus rotundatis. JFilld. sp. pi. 4. p. 463. 

 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. Tj . 



May, June. v. v. From seventy to eighty feet high 5 



generally called Yellow Birch. 



3. B. foliis rhombeo-ovatis duplicato-serratis acutis subtus 



pubescentibus, basi integris, amentis femineis ovatis, 

 squamis villosis, laciniis linearibus sequalibus. — /Fi/W. 

 sp. pi. 4. p. 464. 



B. lanulosa. Mich.Ji. amer. 2. p. 181. 



B. rubra. Mich. arb. 2. p. 142. 



Icon. Mit/i. /. c. /. 3. Willd. arb. t. 2. f. 6. 



On the banks of rivers : New Jersey to Carolina. Tj . 

 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 



hirsutis, petiolo glabro, amentis' femineis peduncula- 

 tis nutantibus, squamis lobis lateralibus brevibus sub- 

 orbiculatis. — Willd. sp.pl. 4. p. 464, 



B. papyrifera. Mich.fi. amer. 2. p. 180. 



Icon. Mich. arb. 2. p. 133. t. 1. Willd. arb. t. 2./. 1. 



In the forests of Canada to a great northern latitude, and 

 as far south as the Hudson's river. P? . 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 



subtus petiolisque pilosis, strobilorum squamis glabris, 

 lobis obtusis aequalibus elevato-venosis. — Willd. sp. 

 pi. 4. 464. 

 B. carpinifolia. Ehrh. beitr. 6. p. gg. 



621 



excelsa. 



iigra. 



papyracea. 



lenta. 



