ROSACEAE 53 



circling the ovoid sessile 1-scaled buds and with about 7 bun- 

 dle-traces; narrow stipule-scars encircling the node; no ter- 

 minal bud; broadly ovate mostly palmately 3- or 5-lobed and 

 coarsely and acutely toothed petioled leaves; and small mon- 

 oecious flowers and very small dry plumed fruits in large glo- 

 bose 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. (Buttonball). P. occidentalis. 

 Leaves variegated. 4. 



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

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



5. Leaves moderately lobed. (Plane tree). 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, 

 cherries: 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 ses- 

 sile rather spreading buds with about 5 exposed scales: ovate 

 more or less 3-lobed irregularly crenately toothed petioled 

 leaves; rather small perfect slender-stalked polypetalous white 

 flowers in compact round clusters 1 at end of the branches; and 

 dry inflated follicles, mostly 3 to a flower. (Opulaster). 

 1. High-growing. 2. 



Dwarf, resembling Ribes. P. opulifolius nanus. 



