COMPOSITE 147 



3. E. csespitdsus, Nutt. 



Perennial; stems tufted, somewhat reclining at the base, 4-12 in. high, 

 usually simple and rather whitish, hairy; stem leaves linear or oblong, 

 sessile; root leaves spatulate, petioled, entire; heads large, solitary, or 

 several on peduncles springing from the axils of the upper leaves;- raya 

 numerous, white, purplish, or pink; outer row of bristles of the pappus 

 short; involucre hairy. Dry prairie, Man.-Alta. 



4. E. ram6sus, (Walt.) B. S. P. 



Annual; stem erect, pubescent, branching from about the centre, and 

 all the branches rising to about the same height; leaves entire, the upper 

 lanceolate and sessile, the lower spatulate and petioled; rays numerous, 

 white; pappus an outer row of short persistent scales and an inner row of 

 slender deciduous bristles; involucre minutely hairy. {E. etrigosus, Muhl.) 

 Moist grassy places, Man. and Saisk. 



tt Pappus single. 



5. E. philadelphicus, L. 



Perennial; stem erect, leafy, rather stout, 1-2 tt. high, branched, softly 

 pubescent throughout; upper leaves oblong, sessile, or clasping, entire 

 lower leaves spatulate, toothed, and short-petioled ; heads numerous, several 

 at the end of each branch ; rays very numerous, narrow, pink. Low grassy 

 places, Man.-Alta. 



18. PETASiTES. Sweet CoLTgpooT. 



Heads many-flowered, usually dioecious, of tubular or both tubu- 

 lar and radiate flowers; involucre of a single row of equal bracts; 

 receptacle flat, naked; pappus of numerous bristles. Woolly 

 perennial herbs from a thick rootstock, producing a scape with 

 scaly bracts and whitish fragrant flowers early in the season, and 

 large leaves later. 



1. P. palm&tus, (Ait.) Gray. 



Leaves round and deeply 5-7-palmately lobed< Bogs, Man.-Alta. 



2. P. sagittatus. Gray. 



Leaves reniform to hastate, very white-woolly beneath, irregularly den- 

 tate. Wet places, Man.-Alta. 



19. ARTEMfSIA. Wormwood. 



Heads small, mostly few-flowered, discoid; flowers all tubular, 

 perfect, or the outer pistillate; involucre dry; receptacle naked. 

 Mostly somewhat shrubby herbs, with bitter juice, often strong 

 aromatic odor, and small nodding heads of yellowish flowers. 



