42 BULLETIN 816, U. S. DEPARTMENT OF AGRICULTURE. 
SYCAMORE. 
The sycamore,! also called the buttonwood and buttonball tree, is ‘| 
a large, open, spreading, quick-growing tree native along water- i 
courses. Jt is adapted to regions 1, 2, 8, 4, 9, 10, 11, 12, and 13 4 
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. Jt 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 being 
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 impression of airiness with the shade. It is subject 
to attack by a fungus that kills the leaves while still small or par- 
tially mutilates them, giving them an unsightly appearance. In 
some places this trouble is quite serious. 
The California sycamore? 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 will 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 account 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- 
erowing tree suitable for suburban conditions in regions 1, 2, 10, 11, 
1 Platanus occidentalis L. 
2 Platanus racemosa Nutt. 
3 Platanus acerifolia (Ait.) Willd. 
4 Bailey, L. H.,ed. New York,1916. Standard Cy cae of Horticulture, v. 5, p. 2707. 
5 Liriodendron fender L. 
