446 



The Thorn Trees 



thick and hard; corymbs smooth, many-flow- 

 ered; leaves thin but firm, smooth with age. 

 Fruit green tinged with scarlet, prominently angled, 



young fruit conspicuously waxy. 

 Fruit cherry-red; terminal leaves heart-shaped at 

 the base. 

 bb Fruit soft when ripe. 



Leaves broadest toward the apex; nutlets 4 or 5; nest 

 of nutlets shorter than thick; fruit hairy; leaves 

 obovate. 

 Fruit red. 

 Nutlets ear-shaped; fruit becoming smooth; leaves 

 thin, dull above; calyx-lobes spreading; corymbs 

 many-flowered. 

 Nutlets rounded at both ends; leaves thick, shining 

 above; calyx-lobes erect; corymbs few-flowered. 

 Fruit lemon-yellow; nutlets 5; leaves thin, bright 

 dark green above. 

 Leaves broadest at the middle. 



Nutlets usually 2 to 4; fruit red, nearly globular; 

 corymbs many-flowered; leaves thin but firm. 

 Nutlets 2, nearly smooth on the back. 

 Nutlets 2 to 4, strongly ridged on the back. 

 Nest of nutlets shorter than thick; fruit about 10 



mm. thick, dark red; leaves 3 to 5 cm. wide. 

 Nest of nutlets longer than thick; fruit about 15 

 mm. thick, carmine-red; leaves 4 to 7 cm. 

 wide. 

 Nutlets 5; nest of nutlets shorter than thick. 

 Leaves broadest toward the base. 

 Fruit smooth. 

 Nutlets usually 3 or 4, with acute ends; frtiit 

 oblong or pear-shaped; flesh thick, succulent, 

 edible; corymbs many-flowered; leaves thin, 

 smooth with age. 

 Fruit pear-shaped; nutlets usually 4; nest of nut- 

 lets longer than thick; leaves oblong-ovate, 

 thin. 

 Fruit oblong or ovoid; nutlets 3 or 4; nest of nut- 

 lets of about equal length and thickness; 

 leaves wedge-ovate. 

 Nutlets usually 5, with rounded ends; nest of nut- 

 lets shorter than thick; fruit large, smooth, scar- 

 let, subglobose to short-oblong, five-angled, calyx 

 prominent; flesh thick and soft, edible; leaves thin, 

 smooth, often broader than long, prominently 

 lobed; corymbs smooth, generally many-flowered. 

 Fruit hairy; nest of nutlets shorter than thick. 

 Leaves slightly lobed; nutlets usually 3 to 5; 

 fruit large, scarlet, hairy, oblong; flesh thick, 

 edible; corymbs many-flowered; leaves thin. 



19. C. pruinosa. 



20. C. silvicola. 



21. C. pyriformis. 



22. C. Ashei. 



23. C. hrazoria. 



24. C. Margaretta. 



25. C. rotundijolia. 



26. C. Joneses. 



27. C. coUina. 



28. C. tenuifolia. 



29. C. pentandra. 



30. C. cocdnioides. 



