6 CONTRIBUTJOXS TO WESTERN BOTANY. 



ing southward to middle Utah, Nevada, etc. It blooms July to 



.September. 



/ t 



E. umbellatum var. Hausknechtii(Danuner Garden Fl. 40 493.) 

 Rays very short or none: involucres small, 2>^ lines lonjf, 

 includin.£,^ tlie loufr teeth; Howers yellow, 2 lines long; peduncles 

 short ; umbel sinif)le ; leaves brc^id ; stems very much, and intricate- 

 ly branched, short and very slender. This occurs in the Alpine 

 regions of Mt. Hoo<l. (")regon, in very loose volcanic gravel. 



E. umbellatum var. Tolmieanum (Hook. Fl. Bor. Am. 2 134.) 



Involucre one, large, with leaf like lobes, sessile at the ends 

 of the slender and short peduncle. This includes E. Ported Small 

 and is the var. monocephalum T. & G. This frequents the lower 

 edge of the Aljiine region in the mountains of Colorado, Utah and 

 Nevada. 



In addition to these varieties of E. umbellatum there are 

 about fifteen synonyms of the species based on fictitious vegeta- 

 tive characters by Greene and Small. 



E. sphaeracephalum var. breyifolium Stokes, 



Peduncles about four inches long, with about 3 rays, the 

 outer rays being leafy-bracteate in the middle, so the inflorescence 

 seems cymose: flowers yellow: involucres about 3 lines long: 

 pubescence of flowers ascending, not dense ; leaves elliptical, slight- 

 ly revolute antl ,sessile : bushes neariy a foot high and rather 

 open. Western Nevada and adjacent California on the east of 

 the Sierras in the Middle Temperate life zone. E. tripodum 

 Greene is a form of this. 



E. sphaeroccphalum var. mefacephftlum (Nutl. PI. Gamb.) 

 Stokes. 



Heads large, and flowers many; rays slender 3-5, not bracted 

 in the middle. This is the commoti form of E. Oregon to Idaho 

 and northward. 



