TlUSTI.K F.YJULV. ST 



L. pinnata T. & U. Stems 2-4 feet high, .stigose-pubesccnt. slender, 

 branched above; leaflets ;)-7. narrowly lanceolate, entire or remotely serrate; 

 disk ovoid: rays about '.! inches long, light yellow, drooping; achenes ob- 

 scurely :.'-tipped. Prairies: July-August; frequent and widely distributed. 

 {Ratibula pinnata ( Vent.) liarnbart.) 



L. columnaris T. &■ (1. Stem 1-'.' feet high, strigose-pubescent and 

 scabrous, branched; leaflets ">-!), oblong to lineiir. entire or ^'-il-cleft. heads 

 on loug peduncles; disk columnar, I-'.' inches long: rays usually shorter, 

 ovate, yellow. Prairies; August; rare: Henry, Page, Mounts, and Lyon coun- 

 ties. (K. eolnmnnris (Sims) 1). Don). 



HELIANTHUS L. Sunfj.owkk. Annual or perennial herbs, with alternate 

 or opposite leaves, and solitary or eorymbed pedunculate heads which termi- 

 nate the stem or branches. Involucre imbricated, leaf-like. Keceptacje 

 plane or convex, with persistent chaff which embraces the achenes. Kays 

 few to many, neutral, yellow. Pappus of 2 c or 4 chaffy scales, mostly decidu- 

 ous. Achenes compressed or 4-angled. 



* Disk purple, purplish or brown; receptacle flat <ir courc.r. 

 f Ouis annual*; lawcx mostly alternate. Hie lower apposite. 



Y\. annuus L. Common Sunflower. Stem 2-10 feet high, usually much 

 branched, hispid or scabrous: leaves mostly alternate, petioled. ovate 

 or lower cordate. 3- nerved, serrate; involucral scales ovate or oblong, long- 

 acuminate, ciliate; disk 1 inch or more across. Commonly cultivated and a 

 common escape fit waste places; infrequent in the wild state; July-Septem- 

 ber. 



H- petiolaris Xutt, Stem supple or .branched. 1-:! feet high, strigose-his- 

 pidulous: leaves ovate-lanceolate or oblong, slender-petioled. usually entire; 

 involucral scales lanceolate or oblong-lanceolate, sometimes ciliate; tips mu- 

 cronate or attenuate: disk about half an inch broad. Dry soil; July-August: 

 rare; Dubuque and Muscatine counties. 



f i-iPerennlal: leave* mostly opposite, the upper alternate. 



Y\. rigidus Desf. Stem 2-4 feet high, simple, sometimes branched, rigid, 

 rou< r h; leaves opposite. :i nerved, nearly sessile, oblong-lanceolate or lower 

 oval, entire or somewhat serrate, rigid, rough on both sides, tapering- both 

 ways: heads large, usually solitary, terminal; scales ovate or oblong, acute, 

 or obtuse, ciliate, appressed; rays l.")-:.'.".; disk dark. Prairies; August-Sep- 

 tember: frequent; Floyd. Hancock. Johnson, Winnebago. Decatur. Ringgold, 

 Taylor. Page, and Fremont counties; reported from Fayette, Scott. Louisa. 

 Storv. Woodbury, Sioux, Lyon, Dickinson, and Emmet counties. (H. scaber- 

 rimus Ell ) 



* * Dlili yellow or yellowish; reeept<telc conic or convex; perennial. 



f Leaves Hsiutlly lanceolate, much tonnei' than w'ule. 



| Leaves mostly basal, the upper bract-lil.e. 



\-\. occidentalis Riddell. Stem 2-3 feet high, somewhat hairy with run- 

 ners from the base, simple, nearly leafless above; leaves oval: 3-nerved. lower 

 ou long hairy petioles, the upper small, nearly sessile and remote: heads 

 small, !-■">. on long peduncles; scales lance-ovate, acute, often ciliate: disk 

 vcllow. Prairies; August-September; frequent; Winneshiek, Johnson, and 

 Lee counties; reported from Clinton, Denton, Fayette, Henry, and Muscatine 

 counties. • , 



X % Leaves mostly caulluc and alternate or opposite. 

 ji Stem scabrous, scabratc or hispid; leaves sessile or nearly so. 



