ROSACEAE. g 



rather small perfect slender-stalked polypetalous white flowers 

 in compact round clusters at end of the branches ; and dry in- 

 flated follicles, mostly 3 to a flower. (Opulaster). 



1. High-growing. 2. 



Dwarf, resembling Ribes. P. opulifolius nanus. 



2. Fruit glabrous. 3. 

 Fruit pubescent. 4. 



3. Leaves green. P. opulifolius. 

 Leaves yellow. P. opulifolius luteus. 



4. Fruits much longer than the sepals. P. intermedius. 

 Fruits little longer than the sepals. P. amurensis. 



STEPHANANDRA. 



Deciduous low shrubs with slender terete twigs ; round con- 

 tinuous pith ; alternate small low crescent-shaped leaf-scars with 

 a single compound bundle-trace; transverse stipule-scars; ses- 

 sile ovoid often superposed buds with several exposed scales ; 

 ovate petioled lobed or toothed leaves ; small perfect polypetalous 

 white flowers in terminal panicles ; and small I- or 2-seeded 

 capsules, dehiscent below. 



Leaves rather small (about 3 cm.), deeply lobed. S. incisa. 



Leaves larger, (often 7 cm.), less deeply lobed. S. Tanakae. 



SPIRAEA. 



Deciduous shrubs of small size or with slender wand-like 

 usually somewhat 5-angled branches, with roundish pale con- 

 tinuous pith ; 5-ranked often pointed divergent buds with sev- 

 eral scales ; small crescent-shaped somewhat raised leaf-scars 

 with a single bundle-trace ; mostly lanceolate serrate occasionally 

 linear and entire or broad and sometimes lobed small leaves 

 often pale beneath ; small white or rosy perfect polypetalous 

 flowers in axillary clusters or forming elongated panicles or 

 compound corymbs; and a number of small usually glabrous 

 follicles in each persistent calyx. 

 T. Leaves linear, (scarcely 5 mm. wide). S. Thunbergii. 



Leaves lanceolate or oblanceolate. 2. 



Leaves ovate or rounded. 8. 



