Family ASTERACEA 187 
Leaves sessile or nearly so, divaricate, all opposite. 
5. H. divaricatus. 
Leaves manifestly petioled, ascending, the upper usually al- 
ternate. 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. tuberosus. 
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. rydbergi. 
All the leaves opposite. 11. H. hirsutus. 
Upper leaves narrowed at the base. 13. H.. tuberosus. 
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. 
A common weed throughout the state. Dismal River; Lincoln; Min- 
den; Nebraska City; Valentine; Weeping Water. 
2. Helianthus petiolaris Nutt. Prairie Sunflower. 
Common in dry, sandy soil over the whole state, often as a weed in 
cultivated ground. Belmont; Broken Bow; Box Butte county; Chel- 
sea; Minden; Mullen; Plattsmouth; Thedford; Wahoo; Whitman. 
3. Helianthus subrhomboideus Rydb. 
Common in prairies over most of the state. Cherry county; Frank- 
lin; Keyapaha county; Minden; Sioux county; Whitman. 
4. Helianthus pumilus Nutt. 
Nebraska, according to Nelson’s Manual of Rocky Mountain Botany. 
5. Helianthus divaricatus L. 
Callaway; Weeping Water. 
6. Helianthus giganteus L. 
In wet soil, mostly in draws and along streams and ditches. Halsey; 
Lincoln; Thedford; Valentine. 
7. Helianthus maximiliani Schrad. 
Common in prairies throughout the state. Bone creek; Franklin; 
Kearney; Lincoln; Minden; Nebraska City; Red Cloud; Valentine; 
Weeping Water. 
8. Helianthus subtuberosus Bourgeau. 
Ainsworth; Atkinson; Long Pine; Red Cloud; Valentine. 
9. Helianthus rydbergi Britton. 
In the sand-hill regions. Hooker county. 
10. Helianthus grosseserratus Martens. 
In moist soil in the eastern part of the state. Callaway; Crete; 
Lincoln; Mullen; Nebraska City; Newark; Plainview; Wahoo; Weep- 
ing Water. 
13 
