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. B o lie ana , 

 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. nivea. The tree 

 was introduced into Eu- 

 rope in 1875 from Turk- 

 estan, and it was named for Dr. C. 

 Bolle, an arboriculturist. The tree 

 bears about the same relation to Popu- 

 lus alba that the L,ombardy poplar 

 bears to Populus nigra. Its fastigiate 

 habit combined with the white foliage 

 and shoots, make it a most emphatic 

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



Populus alba var. Bolle- 

 ana (% nat. size). 



INDEX TO SYNONYMS. 

 Populus angulata = P. monilifera. 

 Populus argentea = P. alba, var. nivea. 

 Populus Atheniensis = P. tremuloides. 

 Populus 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. vimiualis. 



