190 



CAMPANULALES 



13. Artemisia pabularis (A. Nels.) Rydb. 

 Jslebraska according to Rydberg's Flora of Colorado. 



14. Artemisia ludovicicna Nutt. 

 St. Paul; Lincoln. 



15. Artemisia tridentata Nutt. Common Sagebrush. 

 In dry soil in the northwestern part of the state. Hat Creek Basin; 

 Chadron. 



16. Artemisia cana Pursh. Hoary or Smaller Sagebrush. 

 In dry soil in the northwestern part of the state. Alliance; Crawford; 

 Hat Creek Basin; Kiwa Valley; Glen. 



Tribe 9. SENECIONEAE. 



Leaves opposite, rays yellow. 1. Arnica. 

 Leaves alternate. 



Rays none, flowers white or whitish. 



Marginal flowers pistillate, the central ones perfect, plants with 



a rank smell. 2. Erechtites. 



All the flowers perfect, sap milky. 3. Mesadenia. 



Rays present, yellow. 4. Senecio. 



1. Arnica. 1022. 



1. Arnica cordifolia Hook. 



Nebraska according to Britton's Manual. 



2. Erechtites. 1023. 



1. Erechtites hieraclfolia (L.) Raf. 



In the eastern part of the state, not common. Lincoln. 



3. Mesadenia. (Cacalia.) 1023. 



Glaucous, stem terete, leaves lobed or incised. 1. M. triplicifolia. 



Green, not glaucous, stem striate angled, leaves entire or denticulate, 



not lobed. 2. M. tuberosa. 



1. Mesadenia atriplicifoiia (L.) Raf. Pale Indian Plantain. 

 In woods in the eastern part of the state. Nebraska City; Richard- 

 son County. 



2. Mesadenia tuberosa (Nutt.) Britton. Indian Plantain. 

 In low prairies in the eastern part of the state. Lincoln; Nebraska 

 City; Wahoo. 



4. Senecio. 1024. 



Basal leaves neither linear nor parted into linear segments. 



Heads 10-14 mm. high, plant tomentose when young, soon glabrous. 

 Involucral bracts acuminate, leaves mostly entire. 



1. S. integerrimus. 

 Involucral bracts acute or obtuse, mostly black pointed, leaves 

 denticulate. 2. S. atriapiculatus. 



Heads 6-10 mm. high, stems often persistently tomentose. 



Basal leaves entire or rarely somewhat ripand, densely and per- 

 sistently white-tomentose to the inflorescence. 



3. 8. purshianus. 



