258 PROCEEDINGS OF THE AMERICAN ACADEMY 



26. E. LACHNOGTNUM, Torr. Cespitose : leaves oblong-lanceolate : 

 the slender peduncle a foot high, sparingly dichotomous above : invol- 

 ucres solitary, sessile or long-pedunculate : flowers densely tomentose : 

 akene attenuate above, 2 lines long. — S. Colorado and New Mexico. 



***** Perennial, villous, dwarf, with naked peduncles bearing a subcapi- 

 tate umbel : bracts conspicuous : involucres campanulate, 4-8-parted, with 

 erect somewhat unequal lobes : flowers abruptly attenuate at base, villous : 

 akenes glabrous. 



27. E. viLLiFLORUM, Gray, Proc. Am. Acad. viii. 630. Densely 

 cespitose, very villous throughout, the crowded oblanceolate leaves half 

 an inch long : peduncles slender, an inch high : bracts linear : invol- 

 ucres few in the loose heads, bracteate at base, the slender pedicels a 

 line long: flowers 1^ lines long, but little exserted; sepals oblong and 

 nearly equal, silky within and without. — S. Utah; a very peculiar 

 species. 



****** Annuals, di- or trichotomously divided, with mostly conspicuous 

 leafy bracts: involucres turbinate, unequally 4-8Iobed or parted (lobes 

 erect), long-pedunculate or sometimes sessile in the forks: flowers not atten- 

 uate at base: akenes glabrous. — {§ Foliosa, Benth., Torr. & Gray.) 



f- Involucres rather large, deeply cleft : flowers glabrous ; sepals broad and 

 cordate at base. 



28. E. Abertianum, Torr. Stout and leafy, often tall, silky-vil- 

 lous : leaves ovate or subcordate, the bracts becoming oblanceolate or 

 linear: flowers rose-colored, the outer sepals round-cordate, at length 

 2 lines broad, the inner linear-oblong. — E. Arizona and New Mexico. 



29. E. pharnaceoides, Torr. Tall and slender, loosely branched 

 tomentose and villous : leaves linear-oblanceolate, revolute : flowers 

 whitish, a line long ; outer sepals ovate, at length bigibbous at base, the 

 inner linear-oblong, retuse. — Arizona and New Mexico. 



-1- -(- Involucres divided : flowers pubescent, yellow ; sepals narrow, closely 

 appressed to the akene. 



30. E. SALSUGiNOSUM, Hook. Low and leafy, glabrous, somewhat 

 fleshy : leaves spatulate-oblanceolate, the bracts becoming linear : akene 

 acutely triangular, a line long. — W. Wyoming to S. Utah and S. W. 

 Colorado. 



-I- 4- H- Involucres very small, 4-cleft or -parted, few-flowered : flowers pubes- 

 cent, minute, narrow at base : difl^usel}' branched and very slender, glandular : 

 bracts mostly very small. 



31. E. SPERGULiNUM, Gray. Leaves and bracts linear-oblanceolate, 

 hirsute : involucres 1-2-flowered : flowers nearly a line long, slightly 

 puberulent. — In the Sierra Nevada. 



