ASTERACEAE: HELIANTHEAE 181 



In woods and thickets in the southeastern part of the state. Franklin; 

 2. Rudbeckia laciniata L. Cone-flower. 



Lincoln; Nebraska City; Newark; Riverton; Saltillo; Wahoo; Wy- 

 more. 



5. Ratibida. (Lepachys.) 988. 



Disk twice as long as thick, leaf segments lanceolate. 1. R. pinnata. 



Disk 3-4 times as long as thick, rays sometimes brown, leaf segments 



linear. 2. R. columnaris. 



1. Ratibida pinnata (Vent.) Barnhart. Cone-flower. 

 Bluffs and ravines along streams in the southeastern part of the 

 state. Bellevue; Nebraska City; Nemaha; Peru; Wymore. 



2. Ratibida columnaris (Sims.) D. Don. Prairie Cone-Flower. 

 Common in dry soil over most of the state. Anselmo; Aten; Broken 

 Bow; Belmont; Cherry County; Kearney; Lincoln; Mullen; Pine 

 Ridge; Squaw Canon; Valentine. 



6. Brauneria. 989. 



1. Brauneria pallida (Nutt.) Britton. Niger-heads. 



Common on dry prairies throughout the state. Aten; Lincoln; Ne- 

 braska City; Squaw Canon. 



7. Helianthus. 990. 



Disk brownish or dark purple, receptacle flat or nearly so. 

 Annuals, leaves mostly alternate. 



Leaves serrate, bracts of the involucre broadly ovate to oblong, 



hispidly ciliate. 1. H. annuus. 



Leaves entire or nearly so, bracts of the involucre lanceolate or 



oblong-lanceolate, seldom ciliate. 2. H. petiolaris. 



Perennials, leaves mostly opposite. 3. H. subrhomboideus. 



Disk yellow, receptacle convex or low conic, perennials. 



Stems glabrous or sometimes pubescent or puberulent above. 

 Leaves narrowed at the base, broadest at about the middle. 



10. H. grosseserratus. 

 Leaves rounded or truncate at the base, broadest below the 

 middle. 

 Leaves sessile or nearly so, divaricate, all opposite. 



5. H. divaricatus. 

 Leaves manifestly petioled, ascending, the upper usually alter- 

 nate. 12. H. decapetalus. 

 Stems pubescent or scabrous at least below. 



Leaves, at least the lower, ovate or ovate-lanceolate and abruptly 

 contracted at the base, sometimes gradually narrowed in 

 H. tuberosa. 

 All leaves rounded or truncate at the base. 



Leaves entire or nearly so; involucral bracts appressed. 



4. H. pumilus. 

 Leaves serrate or serrulate. 



Upper leaves alternate. 9. H. rydbergii. 



All the leaves opposite. 11. H. hirsutus var. trachyphyllus. 

 Upper leaves narrowed at the base. 



