ICO ROSACEAE. 



10. Fruit black. R. occidentalis. 

 Fruit amber. R. occidentalis pallidus. 



11. Erect or ascending. (Blackberries). 12. 

 With many trailing stems. (Dewberries). 16. 



12. Leaflets not laciniate. 13. 



Leaflets deeply cut. R. laciniatus. 



13. Leaflets narrow, glabrous : prickles few. R. amabilis. 

 Leaflets broad, somewhat hairy : prickles many. 14. 



14. Flowers in elongated clusters : pedicels with many 



dark glandular hairs, and rather short-villous. 15. 



Flowers fewer : pedicels long-villous, glandless or 



with pale glands. R. argutus. 



15. Fruit black. R. allegheniensis. 

 Fruit amber. R. allegheniensis albinus. 



16. Flowers moderate (about 25 mm.). R. procumbens. 

 Flowers large (30 mm.). R. procumbens roribaccus. 



ROSA. Rose. 



Mostly deciduous and prickly shrubs, sometimes trailing or 

 scrambling to a considerable height, with rather soft wood with 

 small diffused ducts, the first in the spring somewhat larger, and 

 relatively coarse medullary rays ; moderately stout usually large 

 and green terete twigs ; rounded continuous pith ; alternate low 

 openly U-shaped leaf-scars with 3 bundle-traces ; no stipule- 

 scars ; ovoid sessile buds with several exposed scales ; odd-pin- 

 nate leaves with dilated stipule-bearing petioles ; large green 

 usually rosy or white perfect polypetalous perigynous flowers, 

 mostly clustered at ends of the branches; and fleshy ovoid fruit- 

 ing receptacle (hypanthium) enclosing a number of large hairy 

 akenes. Too large and complex a genus for satisfactory brief 

 analysis : only a very few of the most striking types are noted. 



1. Evergreen. 2. 

 Deciduous. 3. 



2. Glabrate, trailing. (Memorial rose). R. Wichuraiana. 

 Hairy, scrambling, horrid. (Macartney rose) R. bracteata. 



3. Climbing or forming fountain-like masses. 4. 

 Bushy. 6. 



