108 ERYTHEA. 



Kocky Mountain region, from Arizona and New Mexico 

 northward to borders of British America, at considerable 

 elevations, 



2* E. spinulosum. Amellus splmilosus, Pursh, Fl. ii. 

 564 (1814). Diplopappus pinnatifidns^ Hook. Fl ii. 22 

 (1834). Aplopappus? spinulosus, DC. Prodr. v,347 (1836), 

 Dieleria spinuhsa^ Nutt. Trans. Am. Phil. Soc. vii, 301 

 (1840). Aster pmnatifidits, O. Ktze, Rev. Gen. 316 (1891). 

 In this species the technical characters of the gemis are less 

 pronounced than in any of the others; for the achenes are 

 neither turbinate nor very densely silky-tomentose. The 

 pappus is also more slender, but its bristles are so remark- 

 ably unequal that Sir William Hooker placed the plant 

 under Diplojmppus, In habit it is so wholly like the rest 

 of the group that it can not be separated from them. From 

 the succeeding species, which has hitherto been confounded 

 with it, the canescently tomentose character of the herbage, 

 as well as the mode of growth, thoroughly distinguishes it. 



Plains of the middle and northern Rocky Mountain 

 regions, eastward to Iowa and Minnesota. 



w 



3. E. anstrale. Perennial, the clustered stems erect or 

 ascending, 6 to 18 inclies high, not tomentose but pale and 

 rough with a short spreading somewhat glandular indument: 

 radical leaves pinnatifid, the lobes with few coarse teeth; 

 cauline narrow, pinnately toothed: heads few, solitary at 

 the ends of leafy pe.lnncaliform branches: rays pale yellow: 

 achenes compressed: pappus-bristles not coarse, extremely 

 unequal— Texas, New Mexico, Arizona and adjacent Mexico. 

 Strangely confused with the last, in herbaria; very distinct 

 from it, and nearer the species Following. 



4 E. jnnceura. Aplopappus jnnceAis, Greene, Ball. 

 Calif. Acad. i. 190 (1885).— Species of the mountains of San 

 Diego Co., Calif., and adjacent Lower California. 



5. E. scalirellum. Suffrutescent, the leafy flowering 

 branches rather slender, and with a short hirsutulous pubes- 



