The Cultivated Poplars. 



235 



very white- woolly. This tree is met with occasionally. Its hor- 

 ticultural value is not greatly different from that of var. nivea. 



P. alba, var. Bol- 

 leana (Lauche, Woch- 

 enschrift der Deutsche 

 Garten, No. 32, Aug. 10, 

 1878. P.Bolleana^ 

 Lauche, 1. c). Bolles' 

 Poplar. Fig. 17. A 

 very tall and narrow- 

 topped tree, with cottony 

 leaves rather more deeply 

 lobed than those of the 

 var. yiivea. The tree 

 was introduced into Eu- 

 rope in 1875 from Turk- 

 estan, and it was named for Dr. C. 

 Belle, an arboriculturist. The tree 

 bears about the same relation to Popic- 

 lus alba that the Lombardy poplar 

 bears to Populus nigra. Its fastigiate 

 habit combined with the white foliage //. Populus alba var. Bolle- 

 and shoots, make it a most emphatic '^"'^ (/^ "''^^- •^^^^)- 



tree and there is great danger of planting it too freely. 



INDEX TO SYNONYMS. 



Populus angulata = P. monilifera. 



Populus argentea = P. alba, var. nivea. 



Populus Atheniensis == P. tremuloides. 



Popuhis Bereolensis = P. laurifolia. 



Populus betulifolia = P. nigra. 



Populus Bolleana = P. alba, var. Bolleana. 



Populus Canadensis = P. monilifera. 



Populus canescens of some = P. alba, var. canescens. 



Populus canescens of some = P. nigra, var. 



Populus Carolina = P. monilifera. 



Populus Carolinensis = P. monilifera. 



Populus Certinensis =^ P. laurifolia. 



Populus crispa = P. balsamifera, var. viminalis. 



