148 POLY GONE ^. 



smaller : leaves oblong, revolute, narrowed to a short petiole, ciuereous- 

 tomentose above, the indument denser and white on the lower face : 

 peduncles elongated and naked, bearing mostly 2 or several large heads 

 of clustered involucres, or these not rarely cymose-umbellate : fl. as in 

 the preceding. — Sufficiently distinct from the last by its diflfierent habit, 

 broader, thinner and cinereous foliage, etc. It is in general a plant of 

 the interior rather than of the seaboard, and has a more northerly range 

 than E. fascictilatuin, being plentiful on the mountains of Kern Co., 

 north of the Mohave Desert. July — Oct. 



-!—•)—•)— Leaces nut fascicled; involucres scaiiered in open cymes. 



23. E. microthecum, Nutt. PI. Gamb. 162 (1848). Shrubby at base, 

 erect, rather slender and diffuse, 3 — 12 in. high, more or less white- 

 tomentose : leaves oblanceolate to linear, ig — l^o in. long, acute, more 

 or less revolute, white-tomentose beneath, glabrate above : peduncles 

 short, bearing a short cyme of once to thrice subdivided branches : 

 involucres % — 1% lines long, attenuate at base, some of them peduncu- 

 late : fl. }4 — 1 lin® long, white, rose-color or yellow. — A widely dispersed 

 and variable species of the Rocky Mountain plateau, reaching our 

 borders in the Sierras of Mono Co. and northward, in a reduced and sub- 

 alpine form. 



24. E. corymbosiim, Benth. in DC. Prodr. xiv. 17 (1856). Very near 

 the last, but stouter : leaves broader and longer, less revolute : cyme 

 broader and shorter, with fewer involucres and rather larger flowers. — 

 Of the same distribution as the last nearly ; reaching the eastern base of 

 the Sierra. 



2.5. E. truucatum, T. & G. Proc. Am. Acad. viii. 173 (1870). Annual, 



slender, floccose-tomentose throughout, 1 ft. high : leaves mostly rosu- 



late near the base of the stem, sometimes a whorl subtending the lowest 



node ; blade oblanceolate, 1 in. long, attenuate to a slender petiole, the 



margin undulate : inflorescence very lax, in a kind of umbel of 4 — 6 



elongated and di- or trichotomous rays : inflorescence few, oblong- 



turbinate, 2 lines long : fl. rose-color, 1 line. — Seemingly a local species, 



but plentiful among the hills just at the eastern base of Mt. Diablo. 



-i— -i— H— H— Inroincres scattered along the branches of an open naked 



dichotomoris panicle. 



-M- Snjfrutescenl perennials leafy below; herbage vhite-tomentose; 



panicle of few virgate branches. 



26. E. elongatuiii, Benth. Bot. Sulph. 45 (1844). Woody and leafy 

 stem low (seldom 1 ft.), the simple or sparingly branched*flowering stems 

 often 2 ft. high : leaves somewhat scattered, oblong-lanceolate, or 

 broader, acute, 1 in. long, narrowed to a short petiole, in age glabrate 

 iibove : involucres distant, 2-3 lines long, obtusely toothed : fl. 1 — l^-^ 



