Genus 35.] 



THISTLE FAMILY. 



387 



6. Erigeron canus A. Gray. Hoary 

 Erigeron. (Fig. 3816.) 



Erigeron canus A. Gray, Mem. Am. Acad. ( II ) 4: 67. 1849. 



Perennial by a deep woody root, resembling the 

 preceding species; stems slender, erect, tnfted, ap- 

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

 above. Leaves narrow, entire, canescent, the basal 

 and lower ones narrowly spatulate, petioled, i'-\' 

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

 heads solitary, or 2-4, pedunclcd, 6 // -8 // broad; invo- 

 lucre hemispheric, its bracts linear, acute, densely 

 canescent; rays 40-50, purple or white, i"-}," long; 

 achenes glabrous, S-10-nerved; pappus double, the 

 outer row of bristles rather conspicuous. 



In dry soil, western Nebraska and Wyoming to Colorado 

 and New Mexico. 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. 1814. 



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, \ / -\%. f long, \y z "-2" 

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

 ally numerous; heads solitary or several, slender- 

 peduncled, 5 // -8 // 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. Gray. 

 Running Fleabane. (Fig. 3818.) 



Erigeron flagellaris A. Gray, Mem. Am. Acad. 

 (11)4:68. 1849. 



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 / -2 / long, narrowed into 

 long petioles, the upper sessile, linear or 

 linear-spatulate, much smaller; peduncles 

 solitary, elongated; heads about \' broad 

 and %.' 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. 



