256 PROCEEDINGS OF THE AMERICAN ACADEMY 



silky. — Washington Territory to the Saskatchewan and south to 

 Colorado. 



9. E. ANDROSACEUM, Bcnth. Dwarf, tomentose throughout or 

 smoother above ; caudex branching : leaves oblanceolate : rays short, 

 slender: flowers yellow, 2- or 3 lines long, short-attenuate, sparingly 

 villous. — Rocky Mountains of British America. 



10. E. PYROL^FOLiUM, Hook. Dwarf, somewhat villous ; caudex 

 sim^jle : leaves ruund-obovate to oblong, thick : rays few, very short : 

 flowers rose-color, 2 lines long, short-attenuate, sparingly villous. — 

 Var. CORYPH^UM, Torr. & Gray. More tomentose, with narrower 

 leaves and smaller flowers. — Mountains, N. California and Oregon. 



= = Flowers glabrous : caudex diffusely branched. — In the Sierra Nevada. 



11. E. INCANUM, ToiT. & Gray. Somewhat cespitose , tomentose, 

 low : leaves oblanceolate, shortly petioled : bracts and involucres 

 small : flowers yellow, often reddish. 



12. E. MARiFOLiuM, Torr. & Gray. Low and very slender, dif- 

 fusely branched below, tomentose : leaves ovate to oblong : bracts and 

 involucres (a line long) small : flowers yellow or yellowish. 



13. E. URSiNUM, Watson, Proc. Am. Acad. x. 347. Taller and 

 stouter, tomentose, villous above: leaves ovate: bracts elongated: 

 umbel compound : involucres large : flowers whitish. 



•M- ++ Involucres solitary : peduncle verticillate-bracted in the middle : dwarf. 



14. E. Kelloggii, Gray, Proc. Am. Acad. viii. 293. Very 

 slender, much branched at base, villous-tomentose : leaves oblanceolate, 

 2 to 4 lines long: flowers glabrous, white or rose-colored, Ij to 2^ 

 lines long. — Mendocino Co., California. 



15. E. THYMOiDES, Benth. Densely branching and woody, with 

 revolute linear leaves 1 to 5 lines long : peduncles slender : flowers 

 densely villous with long hairs, purplish, 2 or 3 lines long, with broad 

 sepals. — Oregon and Washington Territory. 



H- ^- Involucres deeply lobed ; lobes becoming reflexed. 



++ Flowers pubescent : involucres solitary (rarely umbellate in n. 18), on verti- 

 cillate-bracted peduncles (naked in n. 16) : low, cespitose, with yellow flow- 

 ers, and leaves tomentose both sides. 



16. E. c^SPiTOSUM, Nutt. Dwarf, densely matted : leaves ovate- to 

 oblong-spatulate, 2 to 6 lines long : peduncles naked. — N. W. Nevada 

 to Wyoming Territory. 



17. E. DouGLASii, Benth. Larger and more diffuse: peduncles 

 with a whorl of oblanceolate leaves in the middle. — N. California, 

 Oregon. 



