1910.] NATURAL SCIENCES OF PHILADELPHIA. 165 



Leaves yellow-green, oblong-ovate; fruit depressed-globose, 



not pentagonal 8. C. amplified. 



Leaves blue-green, ovate; fruit subglobose to ovoid-globose, 



pentagonal 9. C. denudaia. 



Stamens 15-20. 

 Leaves smooth. 

 Fruit obovate. 



Flowers not more than 1.8 cm. in diameter; fruit on long 



drooping pedicels 10. C. leiophylla. 



Flowers more than 2 cm. in diameter; fruit on erect or 



spreading pedicels 11. C. dunmorensis. 



Fruit subglobose to slightly obovate, on slender drooping 



pedicels 12. C. advena. 



Leaves scabrate on the upper surface; fruit short-oblong, on 



erect or spreading pedicels 13. C. torta. 



Stamens 10 or less. 



Mature leaves glabrous. 

 Fruit subglobose. 

 Leaves blue-green. 



Leaves oblong-ovate; rounded or rarely abruptly cuneate 

 at the base; fruit on short stout pedicels, green 



flushed with dark red, not pruinose 14. C. rclicta. 



Leaves ovate, concave-cuneate or rarely rounded at the 

 base; fruit on long slender pedicels, purple-red, 



pruinose... 15. C. crubescens. 



Leaves yellow-green, oblong-ovate, very deeply lobed. 



16. C. divisifolia. 

 Mature leaves more or less scabrate above, broadly ovate, thin, 



yellow-green ; fruit green, becoming red 17. C. cdurescens. 



Anthers pale yellow or white; stamens 20. 

 Mature leaves glabrous. 

 Leaves broad at the base. 



Leaves rounded or truncate at the base. 



Leaves thin; flowers less than 2 cm. in diameter; branchlets 

 only slightly zigzag; spines few, short and stout. 



18. C. latifrons. 

 Leaves thick; flowers 2 cm. or more in diameter; branchlets 



very zigzag; spines numerous, long and slender. 



19. C. tribulosa. 

 Leaves abruptly cuneate or rounded at the base. 



Fruit subglobose. 



Leaves ovate to oval, blue-green; fruit not more than 

 1 cm. in diameter, on slender drooping pedicels. 



20. C. incompta. 

 Leaves broadly ovate, yellow-green; fruit up to 1.3 

 cm. in diameter, on short stout erect pedicels. 



21. C. Shaferi. 

 Fruit short-oblong to slightly obovate; leaves only 3-4 

 cm. long; branchlets very slender, contorted. 



22. C. bedfordensis. 



