ROSACEAE. 101 



4. Leaflets about 7 : flowers small, in spring. 5. 



Leaflets 5: flowers in summer. (Prairie rose). R. setigera. 



5. Flowers white, early. (Polyantha rose). R. multiflora. 

 Flowers red, in dense clusters, later. (Ramblers). 



R. multiflora platyphylla. 



6. Flowers as in the last, through the season. (Baby 



rambler). R. multiflora platyphylla. 



Flowers large or not in dense clusters. /. 



7. Foliage not strongly scented. 10. 



Foliage heavy-scented, with bristly glands : flowers 



double. 8. 

 Foliage aromatic, not bristly : flowers single. 



(Sweetbriers). R. rubiginosa. 



8. Prickles uniform: teeth of leaflets glandless. 



(Damask rose). R. damascena. 



Prickles very unequal : teeth glandularly toothed. 9. 



9. Calyx "mossy". (Moss roses). R. centifolia muscosa. 

 Flowers not "mossy". (Cabbage roses). R. centifolia. 



10. Flowers double. (Tea roses). R. odorata. 

 Flowers single, n. 



11. Flowers yellow, early. (Yellow rose). R. foetida. 

 Flowers pink : stem and foliage pinkish. R. rubrifolia. 



PRUNUS. Plum. Cherry, etc. 



Deciduous or exceptionally evergreen trees or shrubs with 

 hard usually reddish wood with scattered ducts, the first of the 

 year sometimes slightly larger and forming a ring of a single 

 series, and fine medullary rays ; rather slender terete twigs some- 

 times transformed into or ending in spines ; rounded continuous 

 pale pith ; alternate somewhat raised crescent-shaped or half- 

 round leaf-scars with 3 bundle-traces; minute often indistinct 

 stipule-scars ; triangular or ovoid sessile buds, the terminal want- 

 ing in some groups, with several often denticulate exposed scales; 

 chiefly lanceolate serrate petioled leaves ; moderately small white 

 perfect polypetalous perigynous flowers in axillary tufts or ra- 

 cemes ; and various-sized 1-seeded drupes, 

 i. With scar left by terminal bud. 2. 

 With terminal bud present. 10, 



