THE CULTIVATED POPLARS. 



233 



10. Populus tremuloides (Michaux, Fl. Bor.-Am. ii. 243 

 (1803). P. trepida, Willd. Sp. PI. iv. 803. P. Graca and 

 P. Atheniensis of horticulturists). COMMON ASPEN or POPPLE. 

 Fig. 14. This is the commonest of the American poplars, and it 

 ranges from Labrador to Kentucky, New Mexico and California. 

 It is the species 



which springs up 

 in recent clear- 

 ings. In aspect 

 it is much like the 

 European Aspen 

 (P. Tremula}, but 

 the leaves lack en- 

 tirely the deep teeth 

 of that species and 

 they are green on 

 the under side. The 

 catkins are also 

 smaller, and there 

 are other botanical 

 differences. There 

 are no horticultural 

 varieties of this 

 species, so far as I 

 kno w ; but the 

 plant is worthy at- 

 tention from plant- 75. Populus Sieboldi (% nat. size], 

 ers, as already indicated (page 208). 



11. Populus Sieboldi (Miquel, Ann. Mus. Bot. Lugd. iii. 

 29. P. rotundifolia of American nurserymen). Fig. 15. A 

 Japanese species with foliage somewhat like the last only much 

 larger and whitish below. Professor Sargent says* that "this 

 tree is not rare in southern Yezzo, where it grows to the height of 

 twenty or thirty feet, springing up in considerable numbers on 

 dry, gravelly soil." The species is little known in this country. 

 It makes a tree of spreading habit, with rather dark and heavy 

 foliage. It appears to be hardy in western New York. 



*Garden and Forest, vi. 404. 



