182 CAMPAXULALES 



Leaves green on both sides. 13. H. tuberosus. 



Leaves densely white-canescent beneath. 



13a. H. tuberosus var. subcanescens. 



Leaves narrowly lanceolate, gradually narrowed at the base. 



Stems scabrous; leaves very scabrous on both sides, entire or 



denticulate. 7. H. maximiliani. 



Stems hirsute; leaves scabrous above, hirsute beneath, serrate 



or denticulate. 



Leaves mostly alternate, narrowly lanceolate. 6. H. giganteus. 



Leaves mostly, or all opposite, broader and more sharply 



serrate. 8. H. subtuberosus. 



1. Helianthus annuus L. Common Sunflower. 

 Helianthus lenticularis Dougl. 



A common weed throughout the state. Dismal River; Lincoln; Min- 

 den; Nebraska City; Valentine. 



2. Helianthus petiolaris Xutt. Prairie Sunflower. 

 Common in dry sandy soil over the whole state, often as a weed in 

 cultivated ground. Box Butte County; Chelsea; Minden; :\Iullen; 

 Plattsmouth; Thedford; Wahoo; Whitman. 



3. Helianthus subrhomboideus Rydb. 

 Helianthus scaberrimus Ell. 



Common in prairies over most of the state. Cherry County; Franklin; 

 Keya Paha County; INIinden; Sioux County; Whitman. 



4. Helianthus pumilus Nutt. 



Nebraska according to Nelson's Manual of Rocky Mountain Botany. 



5. Helianthus divaricatus L. 

 Callaway. 



6. Helianthus giganteus L. 



In wet soil mostly in draws and along streams and ditches. Halsey; 

 Thedford; Valentine. 



7. Helianthus maximiliani Schrad. 



Common in prairies throughout the state. Bone Creek; Franklin; 

 Kearney; Lincoln; :\Iinden; Nebraska City; Red Cloud; Valentine. 



8. Helianthus subtuberosus Bourgeau. 



Ainsworth; Atkinson; Long Pine; Valentine; Red Cloud. 



9. Helianthus rydbergii Britton. 



In the sand-hill regions. Hooker County. 



10. Helianthus grosseserratus Martens. 



In moist soil in the eastern part of the state. Callaway; Crete; Lin- 

 coln; Mullen; Newark; Nebraska City; Plainview; Wahoo. 



11. Helianthus hirsutus trachyphyllus T. & G. 



In the southeastern part of the state. Bellevue; Nebraska City. 



12. Helianthus decapetalus L. 



Crete; Nemaha; Newark; Valentine; Weeping Water. 



13. Helianthus tuberosus L. Jerusalem Artichoke. 

 In moist soil along streams. Often cultivated for its tubers and often 

 persists as a weed. Ewing; Franklin; Long Pine; Nebraska City; 

 Republican. 



13o. Helianthus tuberosus subcanescens A. Gray. 

 Callaway; Chadron. 



