Genus 35-] 



THISTLE FAMILY. 



387 



6. Erigeron canus A. Gray. Hoary 

 Erigeron. (Fig. 3816.) 



£rj]g-fro«c<i«K5 A. Gray, Mem. Am. Acad. (11)4:67. 1S49. 



Perenuial by a deep woody root, resembling the 

 precediug species; stems slender, erect, tufted, ap- 

 pressed-canescent, 6'-io' high, simple, or branched 

 above. Leaves narrow, entire, canescent, the basal 

 and lower ones narrowly spatulate, petioled, 2'-4' 

 long, the upper linear, sessile, acute, gradually smaller; 

 heads solitary, or 2-4, pcduncled, 6"-8" broad; invo- 

 lucre hemispheric, its bracts linear, acute, densely 

 canescent; rays 40-50, purple or white, 2"-y long; 

 achenes glabrous, S-io-nerved; pappus double, the 

 outer row of bristles rather conspicuous. 



In dry soil, western Nebraska and Wyoming to Colorado 

 and Xew SIcxico. June-Aug. 



7. Erigeron hyssopifolius Michx. 

 Hyssop-leaved Erigeron. (Fig. 3817.) 



Erigeron hyssopifolius Michx. Fl. Bor. Am. 2: 123. 



1803. 

 Aster graminifolius Pursh, Fl. Am. Sept. 545. 1S14. 



Perennial by slender rootstocks; stems tufted 

 or single, very slender, simple or branched, gla- 

 brous or very nearly so, 4'-i5' high. Leave nar- 

 row, thin, the basal and lower ones oblong or 

 spatulate, short-petioled, I'-i^' loag, iK"-2" 

 wide.the upper linear or linear-oblong,acute,usu- 

 ally numerous; heads solitary or several, slender- 

 peduncled, 5"-S" broad; peduncles appressed 

 pubescent, involucre hemispheric, its bracts lin- 

 ear-lanceolate, sparingly pubescent; rays 20-30, 

 white or purplish, 2"-3" long; pappus simple. 



On moist cliffs, Newfoundland to northern Ver- 

 mont, west to the Northwest Territory and Lake 

 Superior. July-Aug. 



8. Erigeron flagellaris A. Q,x^y. 

 Running Fleabane. (Fig. 3818.) 



Erigeron flagellaris A. Gray, Mem. .\m. Acad. 

 (11)4:68. 1S49. 



Appressed-pubescent, sometimes densely 

 so, perennial by decumbent rooting stems or 

 stolons; root slender. Stem slender, branch- 

 ed, the branches elongated; leaves entire, 

 the basal and lower ones spatulate or oblong, 

 obtuse or acute, \'~i' long, narrowed into 

 long petioles, the upper sessile, linear or 

 linear-spatulate, much smaller; peduncles 

 solitary, elongated; heads about i' broad 

 and '4' high; involucre hemispheric, its nar- 

 row bracts pubescent; rays very numerous, 

 white to pink; pappus double, the outer 

 series of subulate bristles. 



In moist soil, South Dakota to Colorado, Utah, 

 western Texas and New Mexico. May-July. 



