200 COMPOSITAE 



Stems hairy. 



Leaves 3 lobed or parted. 



Rays 8-12. 1. R. triloba. 



Rays 15-20. 2. R. subfomentosa. 



Leaves not 3-lobed or parted. 3. R. hirta. 

 Stems smooth or nearly so. 



Leaves pinnatifid. 4. R. laciniata. 



Leaves cordate-clasping at base. 5. R. amplexicaulis. 



Leaves oval, petioled. 6. R. grandiflora. 



1. R. triloba L. Much branched, 2-5 high : heads V broad : chaff 

 awn-pointed, smooth. Abundant in rich woods. July-September. 



2. R subtomentosa Pursh. 2-6 high : upper leaves ovate-lanceo- 

 late, serrate : heads 2 X -3 X broad, sweet-scented : chaff blunt, pubescent at 

 apex. Rather common on prairies in the southern part July-September. 



3. R. hirta L. NIGGER-HEAD. l-3 high : leaves oblong or lanceo- 

 late, usually nearly entire : involucral bracts large, spreading : heads 2'- 

 3' broad : chaff acutish, hirsute at apex. Possibly native in the southern 

 part, but commonly adventized in fields. June-September. 



4. R. laciniata L. 2-10 high: leaves slightly roughish : disk 

 greenish : heads 2 X -4 X broad : rays 6-10, drooping : chaff truncate, downy 

 at apex. Common in low woods. July-October. 



5. R. amplexicaulis Vahl. 1-2J high, almost glabrous : leaves 

 ovate-oblong, slightly toothed : heads l^ / -2 / broad : rays few, brownish 

 at base. Occurs sparingly as a waif in waste places in Kansas City. 

 June-July. 



6. R. grandiflora C. C. Gmel. 2-3 high : leaves nearly entire : heads 

 2 X -3 X broad : rays 10-15, soon drooping. Occurs sparingly as a waif 

 along railroads east of Sheffield. July. 



25. RATIBIDA Raf. CONE-FLOWER. 



Perennial, pinnately-leaved herbs. Rays drooping, 4-10. Chaff trun- 

 cate, canescent at apex. Pappus none or of one or two teeth. 



Disk as thick as long. 1. R. pinnata. 



Disk much longer than thick. 2. R. cohimnaris. 



1. R. pinnata (Vent.) Barnhart. 2-6 high, appressed-hoary : leaf- 

 divisions 3-7, lanceolate : rays \\ f long, drooping. Common on dry rocky 

 hills, especially in the southern part. June-September. 



2. R. columnaris (Sims) D. Don. l-3 high, strigose-pubescent : 

 leaf-divisions 4-9, linear : rays | x long, drooping. Not infrequently 

 adventized along railroads, especially at Sheffield and Westport. June- 

 September. 



26. BRAUNERIA Neck. PURPLE CONE FLOWER. 

 Involucral bracts imbricated. Receptacle conical. Rays drooping. 

 Chaff spiny-tipped, longer than the disk-flowers. Ray flowers neutral. 

 Disk-flowers perfect. Achenes quadrangular. Pappus a short crown. 



