CRATAEGUS IN MISSOURI. 



41 



Calyx-lobes glabrous ; fruit subglo- 



bose to short-oblong or slightly 

 obovate^ scarlet; spines slender. 



12. C ferox. 



Primary veins prominent. 



Leaves rounded or rarely acute at the 

 apex; fruit short-oblong to slightly 

 obovate, rounded at the ends, dull 

 crimson, 7-8 mm. in diameter. 



13. C. alhanthera. 



Leaves acute, rounded and short- 

 pointed or acuminate at the apex; 

 fruit short-oblong, tnmcate at the 

 ends, scarlet, up to 1.5 cm. long. 



14. C pachT/phjlla, 



Leaves oblong-obovate, acuminate, or rarely 

 rounded at the apex; flowers in mostly 12-16- 

 flowered corymbs; stamens 5-8, usually 5 or 6; 

 fruit short-oblong, dark red. 



15. C, caridens. 



Leaves 



rarely rounded at the apex, their veins mostly 

 within the parenchyma; flowers in usually 10-12- 



16. C. monosperina. 



flowered corymbs; styles gei 

 to ovate, dull red. 



Leaves oblong-obovate, rounded or truncate at the 

 broad apex, their veins mostly within the paren- 

 chyma; flowers in compact 5-1 5- flowered 

 corymbs; fruit short-oblong to slightly obovate, 

 crimson. 17. C. truncata. 



Leaves oval to shghtly obovate, acute or acuminate 

 at the apex, their veins within the parenchyma; 

 flowers in 10-15-flowered corymbs; fruit sub- 

 globose to short-oblong, crimson; spines small 



and slender, often wanting 



18. C. tenuispina. 



Leaves broadly obovate to oblong, rounded or 

 acute at the apex, their veins within the paren- 

 chyma ; flowers in many-flowered cor jTiibs ; 

 fruit subglobose, dull green tinged with red. 



19. C. PalmerL 



Stamens 20. 



Anthers rose color or pink. 



2-4 



ed corymbs; anthers pink; 



5; fruit often broader than 

 high, bright cherry-red ; leaves on vigorous shoots 

 broadly ovate to orbicular. 20. C. rotunda. 



