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; fruit 

 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. 



n 



19. C. priiinosa. 



20. C. silvicola. 



21. C. pyrijormis. 



22. C. Ashei. 



23. C. brazoria. 



24. C. Margaretta. 



25. C. rotundifolia. 



26. C. Jonesce. 



27. C. collina. 



/ 



\ 



28. C. tenuifolia. 



29. C. pentandra. 



30. C. coccinioides. 



