'IKKKS ()I- I II I XoKIIIKUN f Ml Kit StATK> I>'-'< 



helow arc iiktcIv hyhrid.s or tonus of freely interl)reediiiK 

 elementary varieties. Many of the specific English names are 

 also unsatisfactory. 



Required for identification, the leaves and fruit. 

 1. Leaves not deltoid-cordate. 2. 



1. Leaves conspicuously deltoid-cordate, glabrous. (Cor- 



datae). 5.^). 



2. Leaves glabrous, glabrous above and pubescent beneath, 



or pubescent on both sides. •">. 



2. Leaves pubescent above, glabrous beneath; thorns V-^ i'l- 



long; fruit black. (Douglasianae). 54. 

 o. Petioles ^ in. long or longer. 4. 



3. Petioles less than i in. long. (Parvifoliae). 53. 



4. Leaves not deeply cut. 5. 



4. Leaves deeply cut, lobes numerous ; thorns less than 1 



in. long (Oxyacanthae). 52. 



5. Leaves broadest at the middle or apex, cuneate. 0. 



5. Leaves broadest at the base. 12. 



6. Leaves broadest toward the apex. 7. 



6. Leaves broadest at the middle. 8. 



7. Leaves shining, not impressed-veined above. (Crus- 



galli). 14. 

 7 Leaves dull, impressed-veined above. (Punctatae). 18. 



8. Petioles usually glandless, or if so then the nutlets pitted 



on the ventral faces. 0. 



8. Petioles always with small stalked glands along their 



entire length: nutlets without ventral pits. (Tntri- 

 catae). 30. 

 0. Calyx-lobes glandular-laciniate. glandular-serrate, or 

 glandular-margined. 10. 



9. Calyx-lobes not glandular-margined ; leaves not im- 



pressed-veined, often trilobed towards the apex. 

 (Virides). 29. 

 10. Leaves impressed-veined. 11. 



10. Leaves not impressed-veined, elliptic ovate to orbicular; 



calyx-lobes glandular-margined ; leaves not trilobate 

 (Rotundifoliae). 24. 



11. Leaves rhombic-elliptic; calyx-lobes usually deeply cut; 



nutlets deeply pitted on the ventral faces. (Macracan- 

 thae). 21. 



