ASTERACEAE: ASTEREAE 18:3 



8. Verbesina. 996. 



1. Verbesina alternifolia (L.) Britton. 



Common in woods in the eastern part of the state. Lincoln; Nebraska 



City. 



9. Coreopsis. 997. 



Rays yellow with brown bases or entirely brown, leaves pinnately 

 parted. 1. C. tinctoria. 



Rays entirely yellow, leaves not pinnately parted. 



Leaves three-lobed to below the middle, lobes oblong-linear. 



2. C. palmata- 

 Leaves three-divided nearly or quite to the base, lobes filiform- 

 linear. 3. C. verticillata» 



1. Coreopsis tinctoria Nutt. Tickseed. 

 A common weed in waste places throughout most of the state. Atkin- 

 son; Fairbury; Fillmore County; Franklin; Lincoln; :\Iinden; Red 

 Cloud; Spe'ncer. 



2. Coreopsis palmata Nutt. 



In woods and prairies in the southeastern part of the state. Elm- 

 wood; Nebraska City; Richardson County; Talmage; Nemaha. 



3. Coreopsis verticillata L. 

 Nebraska according to Britton's Manual. 



10. Bidens. 1000. 



Leaves lanceolate, serrate, not pinnately parted or dissected. 



Heads nodding after flowering. 2. B. cernua. 



Heads remaining erect. 



Rays large, commonly 25 mm. long or more. 1. B. laevis. 



Rays small or wanting 3. B. comosa. 



Leaves, at least some of them, pinnately parted or dissected. 

 Rays small or wanting. 



Achenes flat, awns 2, nearly as long as the achene. 4. B. frondosa.. 

 Achenes linear, awns 4, achene several times as long as its awns. 



5. B. bipinnata. 

 Rays large and conspicuous. 



Achene cuniate or linear-cuniate, less than 2 mm. wide. 5-7 mm. 

 long. 6. B. trichosperma. 



Achenes 2-4 mm. wide with thin scarious margins. 



Outer bracts 8-10, not longer than the inner, smooth or ciliate. 



7. B. aristosa. 

 Outer bracts 12-20, longer than the inner, coarsely hispid. 



8. B. involucrata. 



1. Bidens laevis (L.) B. S. P. 



In meadows and along streams. Ainsworth; Banner County; Grand 

 Island; Lawrence Fork; Lincoln; Mullen; Nebraska City; Roca. 



2. Bidens cernua L. 



Common in wet soil throughout the state. Callaway; Ewing; Greeley; 

 Lincoln; Newark; Roca. 



