42 BULLETIN 816, U. S. DEPARTMENT OF AGEICULTURE. 



SYCAMORE. 



The sycamore/ also called the buttonwood and buttonball tree, is 

 a large, open, spreading, quick-growing tree native along water- 

 courses. It is adapted to regions 1, 2, 3, 4, 9, 10, 11, 12, and 13 

 and is worth testing in regions 5, 6, 7, and 8. Its habit of shedding 

 its outer bark in large flakes, leaving the white new bark showing in 

 large patches, makes it a conspicuous tree wherever grown. The 

 fruits are balls 1 inch or more in diameter and are sometimes ob- 

 jected to because they make dirt when falling; also the shed bark 

 is considered objectionable. It is such a strong-growing handsome 

 tree and succeeds so well under city conditions that it is being planted 

 more and more frequently. It will stand more pruning and shaping 

 than any other street tree. Without pruning it is too large for ordi- 

 nary streets unless spaced at almost double the usual planting dis- 

 tance, with the trees staggered along the street instead of bemg 

 planted opposite. Its high head and open habit of growth are dis- 

 tinct advantages for street planting. Its foliage, too, is a light green, 

 which gives an ijnpression of airiness with the shade. It is subject 

 to attack by a fungus that kiUs the leaves while stiU smaU or par- 

 tially mutilates them, giving them an unsightly appearance. In 

 some places this trouble is quite serious. 



The California sycaniore ^ is a native of California adapted to 

 regions 1, 2, 3, and 4 and portions of region 5. It is similar in gen- 

 eral characteristics to the sycamore. 



The London plane tree^ is one of the Old World forms of sycamore. 

 According to Alfred Rehder,^ ''the true oriental plane is rare in 

 cultivation, the tree usually planted under this name being Platanus 

 acerifolia.^' It it more compact in habit of growth and has the 

 other good qualities of the sycamore. It is being more and more 

 used on city streets and is proving satisfactory in regions 1, 2, 3, 4, 

 9, 10, 11, and 12. It wiU probably succeed in the warmer parts of 

 regions 6 and 7 and also in regions 5 and 8. It is a more desirable 

 tree for ordinary use than the sycamore, on accoimt of its more 

 compact habit and comparative freedom from disease, though it is 

 tender in the northernmost sections. 



TULIP TREE. 



The tulip tree ^ is also sometimes called the tulip poplar or yellow 

 poplar, though the latter names are unfortunate, as the tree is not a 

 poplar or even closely related to the poplars. It is a large, rapid- 

 growing tree suitable for suburban conditions in regions 1, 2, 10, 11, 



1 Platanus occidentalis L. 



2 Platanus racemosa Nutt. 



3 Platanus aeerifolia (Ait.) Willd. 



< Bailey, L. n., ed. New York, 1916. Standard Cyclopedia of Horticulture, v. 5, p. 2707. 

 6 Liriodendron tuUpifera L. 



