260 PROCEEDINGS OF THE AMERICAN ACADEMY 



++ -M. Pedicels erect or somewhat spreading : outer sepals much broader above. 



39. E. Thuebeki, Torr. Very slender, tomentose below: leaves 

 small : pedicels a half to an inch long : involucres often glandular- 

 puberulent : flowers becoming a line long ; outer sepals with a large 

 rounded terminal lobe, minutely pubescent in the centre. — S. Cali- 

 fornia and Arizona. 



40. H ROTUNDiFOLiUM, Benth. Rather stouter and more diffuse, 

 with larger leaves : pedicels shorter and more rigid : flowers becoming 

 \l lines long, the outer sepals very broadly dilated above. — New 

 Mexico and W. Texas. 



•*--(--(- Flowers mostly minutely glandular-hispid, longer than the small in- 

 volucre, the outer sepals mostly ovate : pedicels long and filiform, rarely 

 deflexed. 



++ Leaves floccose-tomentose : stem not inflated : pedicels all in the forks or 

 terminating the branches. 



41. E. PUSiLLUM, Torr. & Gray. Often tall and rather stout: 

 leaves rounded or obovate, usually less tomentose above: greenish 

 bracts and involucres minutely glandular-hispid : involucres hemispheri- 

 cal : flowers yellow, often reddish : akene thick-lenticular. — N. W. 

 Nevada to Arizona and S. California. 



42. E. RENiFORME, Torr. Low and slender, glabrous : leaves reni- 

 form or cordate-orbicular, densely white-tomentose both sides : bracts 

 smooth, the margins ciliate : involucres smooth, turbinate-campanulate, 

 nearly a line long : flowers rose-colored, glabrous ; sepals ovate-oblong. 

 — S. California. 



43. E. SUBRENIFORME. Sparingly villous at the nodes: leaves 

 round-reniform or -cordate, tomentose beneath, silky-villous above : 

 involucres smooth, turbinate-campanulate, ^ line long : flowers rose- 

 colored, glabrous, or slightly hispid ; sepals oblong. — E. rem'forme, 

 Torr. & Gray, Rev. 184, in part. Arizona, S. Utah. 



44. E. TuOMASir, Torr. Low, very slender, glabrous : leaves 

 rounded and ovate, small : bracts minute, glabrous : involucres turbi- 

 nate-campanulate, smooth : flowers yellowish, often reddish, slightly 

 hispid or glabrous ; outer sepals often much dilated below, the inner 

 Hnear-oblong. — S. California to S. W. Colorado. 



■M- ++ Leaves more or less villous-pubescent or glabrous, not tomentose : stem 

 often inflated : pedicels often scattered and secund on the branches. 



45. E. TRiCHOPODUM, Torr. Glabrous, diffusely much branched and 

 very slender, the stem rarely inflated : leaves pubescent : bracts very 

 small: involucres minute: pedicels 3 to lines long : flowers yellow- 



