88 RoSACEAE. 



PLATANUS. Sycamore. Buttonball. 



Deciduous trees with exfoliating bark while young; light 

 brown rather firm wood with minute diffused ducts and close 

 and rather thick medullary rays ; moderate usually elongated 

 roundish twigs ; roundish continuous browning pith ; somewhat 

 raised 2-ranked nearly annular crenulate leaf-scars encircling 

 the ovoid sessile i-scaled buds and with about / bundle-traces ; 

 narrow stipule-scars encircling the node ; no terminal bud ; 

 broadly ovate mostly palmately 3- or 5-lobed and coarsely and 

 acutely toothed petioled leaves ; and small monoecious flowers 

 and very small dry plumed fruits in large globose long-stalked 

 aggregates. 



1. Fruit aggregates solitary : stipules large toothed. 2. 



Fruit aggregates usually 2. P. acerifolia. 



Fruit aggregates usually 3 or 4: stipules subentire. 5. 



2. Tree ovoid. 3. 



Tree oblong. P. occidentalis pyramidalis. 



3. Leaves green. P. occidentalis. 

 Leaves variegated. 4. 



4. Leaves white-blotched. . P. occidentalis Suttneri. 

 Leaves yellow-blotched. P. occidentalis aureo-variegata. 



5. Leaves moderately lobed. P. orientalis. 

 Leaves deeply lobed. P. orientalis digitata. 



Family ROSACEAE. Rose Family. 



A large and very heterogeneous family yielding the most 

 important fruits of temperate regions, e.g. strawberries, rasp- 

 berries, blackberries, apples, pears, peaches, plums, apricots, cher- 

 ries : including many shrubs indispensable in landscape work. 



PHYSOCARPUS. Ninebark. 



Deciduous shrubs with exfoliating bark ; moderately slen- 

 der twigs decurrently angled or grooved below the nodes; 

 roundish continuous pith ; alternate raised often 3-lobed leaf- 

 scars with 3 bundle-traces ; decurrent stipule-scars ; ovoid sessile 

 rather spreading buds with about 5 exposed scales ; ovajie more 

 or less 3-lobed irregularly crenately toothed petioled leaves ; 



