840 



ARBORETUM ET FHUTICETUM BRITANNICUM. 



from moisture in the soil during winter, the alleys between the beds may be 

 deepened, so as to act as drains. In the nursery lines, the plants require 

 very little pruning, and their after-care, when in plantations, is equally simple. 



& 2. B.(? A.) DAU V RICA Pall. The Daurian Birch. 



Identification. Pall. Ross., 1. p. 60. ; Willd. Sp. PI., 4. p. 463. ; N. Du 



Ham., 3. p. 204. 

 Synonym.es. B. excelsa canadensis Wang. Beitr. p. 86. ; Bouleau de 



Siberie, Fr. 

 Engravings. Pall. Ross., 1. t. 39.; Willd. Baum., t. 1. f. 3. and 4. ; and 



our fig. 1529. 



Spec. Char., fyc. Leaves ovate, narrow at the base, 

 quite entire, unequally dentate, glabrous. Scales of 

 the strobiles ciliated on their margins ; side lobes 

 roundish. (Willd.) A deciduous tree. Dauria, and 

 part of Asiatic Siberia ; but not in European Siberia, 

 nor in Russia. Height 20 ft. to 30 ft. Introduced 

 1796. Catkins whitish brown, larger than those of the 

 common birch ; February and March Fruit brown; 

 ripe September. Decaying leaves red or yellow. 



Variety. 



B. (? A.) d. 2 parvifdlia Hayne Dend. p. 167. 

 Leaves smaller than those of the species. 



1530. B. fruticosa. 



& 3. ^.(?^.)FRUTICO'SA Pall. The shrubby Birch. 



Identification. Pall. Ross., 1. p. 62. ; Willd. Sp. PL, 4. p. 466. ; N. 



Du Ham., 3. p. 208. 

 Synonymes. B. humilis Schrank Sal. p. 56. ; B. quebecct:ns ; s 



Schrank der Gesells. Naturf. Freunde, 5. p. 196. 

 Engravings. Pall. Ross., 1. 1. 40. ; Dend. Brit., t. 154. ; and our 



fig. 1530. 



Spec. Char., $c. Leaves roundish-ovate, nearly 

 equally serrate, glabrous. Female catkins oblong. 

 (Willd.) A deciduous shrub. Eastern Siberia, 

 Germany, and Canada. Height 5 ft. to 6 ft. in 

 moist situations, but much higher on mountains. 

 Introduced in 1818. Catkins whitish brown ; 

 February and March. Fruit brown ; ripe in 

 October or November. 



.a 4. B. (? A.) pu r MiLA L. The hairy dwarf Birch. 



Identification. Willd. Sp. PL, 4. p. 467. ; Pursh Fl. Amer. Sept., 2. p. 622. ; N. Du Ham., 3. p. 207. 



Synonyme. B. n^na Kalm Kin. 2. p. 263. 



Engravings. Jacq. Hort. Vind., t. 122. ; Dend. Brit., t. 97. ; and our Jig. 1531. 



Spec. Char., $c. Branches pu- 

 bescent, without dots. Leaves 

 roundish ovate, on long foot- 

 stalks, densely clothed with 

 hairs on the under surface. 

 Female catkins cylindrical. 

 (Willd.') A deciduous shrub. 

 Canada, in bogs, and on high 

 mountains in New York and 

 Pennsylvania. Height 2 ft. 

 to 3 ft. Introduced in 1762. 

 Catkins whitish ; May and 

 June. Fruit brown. 

 The root is red, and is used 



for veneering and inlayiiu 



5. JS. NA'NA L. 



1531. B. (?A.) pfcmila 



The dwarf Birch. 



Identification. Lin. Sp. PL, 1394. ; Eng. FL, 4. p. 154. Pursh Fl. Amer. Sept., 2. p. 262. 



