POMACEAE. 183 



Calyx-tube short; fruit bitter and acid. 



20. C. callosa. 

 Leaves narrow-ovate to oblong-ovate; shrubby, usually 2-5 m. 



high. 

 Flowers about i.2 cm. in diameter, in compact, mostly 4-7- 

 flowered corvmbs; fruit often obovate. 



21. C. Cestrica. 

 Flowers often 2 cm. in diameter, in lax 5-10-flowered 



corymbs. 22. C. augusta. 



Fruit obovate, dull green tinged with red, 1-2 cm. long; leaves 

 oblong-ovate. 23. C. insueta. 



Stamens 10 or less. 



Anthers pink, dark rose-color or purple. 

 Leaves smooth on the upper surface. 



Leaves ovate to rhombic, cuneate at the base ; fruit depressed- 

 globose, crimson, slightly pruinose, 1-1.2 cm. in diameter; 

 anthers pale pink. 24. C. dissona. 



Leaves rhombic or occasionally oblong-ovate, deeply laeiniately 

 lobed; fruit oblong to short-oblong, crimson, covered with a 

 thick glaucous bloom, about 1.2 cm. long; anthers purple. 



25. C. alacris. 

 Leaves oval to ovate ; cuneate at the base ; fruit short-oblong 

 to ovate, conspicuously mamillate at the base, dull red, cov- 

 ered with a glaucous bloom, 1-1.2 cm. in diameter; anthera 

 purple. 26. C. deduct a. 



Leaves scabrate on the upper surface ; anthers dark rose-color. 

 Pedicels glabrous. 



Leaves ovate, as broad as long, truncate or rounded at the 

 broad base; fruit depressed-globose, bright red, 1-1.2 

 cm. in diameter. 27. C. deltoides. 



Leaves ovate, usually rounded or cuneate at the base; 

 fruit obovate, greenish-red, with a crimson cheek, 1.2-1.5 

 cm. long. 28. C. Fretsii. 



Leaves ovate to rhombic, rounded or cuneate at the base; 

 fruit obovate, orange-red, 8-10 mm. long. 



29. C scdbriuscula. 

 Pedicels villose; leaves ovate, usually rounded or truncate at 



the broad base, deeply lobed; fruit oblong to obovate, duU 

 red, covered with a glaucous bloom, 1.4-1.5 cm. long. 



30. C. delicata. 

 Anthers pale yellow ; leaves rhombic to ovate, gradually narrowed be- 

 low, or broadly cuneate at the entire base, membranaceous ; fruit sub- 

 globose, dark red. 31. C. Delawarensis. 



IV. Tenuifoliae. 

 Fruit longer than wide. 



Fruit oblong; anthers dark pink or purple. 

 Petioles 1.5-2 cm. long. 



Leaf-lobes short, mostly pointing forward. 



32. C. tenella. 

 Leaf -lobes long, spreading, often recurved. 



33. C. rufipes. 

 Petioles 2-3 cm. long. 



Pedicels elongated, slender; corymbs broad and open, leaves 

 broad-ovate to nearly orbicular, yellow-green. 



34. C. lata. 

 Pedicels short ; corymbs compact ; leaves ovate to ovate-oblong, 



blue-green. 

 Corymbs 4-6-flowered; mature leaves scabrate. 



35. C. Collinsiana. 

 Corymbs 8-12-flowered; mature leaves smooth. 



", 36. C. pumila. 



