ROSACEAE 61 



usually in terminal corymbs; and small apple-like fruits with 

 bony core. A hopelessly complex genus: the following com- 

 mon. 



1. Leaves spatulate or cuneate-obovate rarely large or lobed. 2. 

 Leaves elliptical or obovate. 4. 



Leaves round or ovate. 6. 



2. Leaves glabrous, glossy above: spines long. C. Crus-galli. 

 Leaves pubescent beneath. 3. 



3. Leaves dull, with strong veins. C. punctata. 

 Leaves glossy above, fruit often downy. C. tomentosa. 



4. Spines curved: nutlets with concave sides. C. macracantha. 

 Spines straight: nutlets with flat sides. 5. 



5. Spines long: leaves rather thin and dull. C. tomentosa. 

 Spines short: leaves rather firm or glossy. C. viridis. 



6. Leaves deeply lobed. 7. 



Leaves at most shallow-lobed. 21. 



7. Veins running from midrib both to sinuses and lobes. 8. 

 Veins running from midrib to lobes only. C. Phaenopyrum. 



8. Style one. 9. 



Styles two or three. 19. 



9. Spiny. 10. 



Unarmed. C. monogyna inermis. 



10. Leaves moderately lobed. 11. 



Leaves incised. C. monogyna laciniata. 



11. Shrubby, ever-blooming. C. monogyna sernperflorens. 

 Tree-like. 12. 



12. Somewhat fastigiate. C. monogyna stricta. 

 Not fastigiate. 13. 



13. Flowers white. 14. 

 Flowers rosy or red. 15. 



14. Flowers single. (Hawthorn). C. monogyna. 

 Flowers double. C. monogyna albo-plena. 



15. Somewhat weeping. C. monogyna rosea pendula. 

 Not weeping. 16. 



16. Flowers single. 17. 



Flowers double. C. monogyna rubro-plena. 



