146 



SELECTED WESTERN FLORA 



5. A. puniceus, L. Porple Stem Astee. 



Stems stout, 2-7 ft. high, rough, purplish below; leaves eblong to \anoe- 

 olate, clasping the stem at the base ; heads large, 1-1 Jin. across, showy, with 

 20-40 pink or purple rays. Moist soil, Man.-Alta. 



6. A. paniculatus. Lam. 



Stem smooth, 1-2J ft. high, erect, much branched; leaves narrowly 

 lanceolate, tapering to a point, usually entire; rays white or purplish; heads 

 rather scattered on the ends of the branches, the whole forming a sort of 

 large loose panicle. An extremely variable species represented with us 

 mostly by var. bellidiflorus, Willd. Moist soil, Man.-Alta. 



7. A. laevis, L. 



Fairly stout, 1-3 ft. high, smooth; leaves lanceolate to ovate, entire, 

 the upper clasping, the root leaves petioled, those on the branches reduced 

 to rigid bracts; heads showy; rays 15-20, violet blue. A common and 

 beautiful species. Dry soil, Man.-Alta. 



17. ERIGERON. Fleabane. 



Heads many-flowered, radiate; rays linear, white, purplish, or 

 pink, pistillate; disk-flowers perfect, tubular, yellow; bracts of the 

 involucre narrow, over-lapping, in 1 or 2 rows; pappus a single 

 row of mixed long and short bristles, or with a distinct outer row of 

 short bristles or scales ; achenes usually pubescent. 



* Rays short and obscure. 



1. E. canadensis, L. Fireweed. 



Stem erect, stout, 2-6 ft. high, densely hairy through- 

 out; stem leaves linear, entire, sessile; root leaves spatulate, 

 more or less toothed or cut and tapering to a petiole; heads 

 numerous, cylindrical. Waste or poorly cultivated places, 

 a common annual weed. 



** Rays conspicuous. 

 t Pappus double. 



2. E. glabellus, Nutt. 



Stem rather stout, 4-15 in. high, hairy above, rather 

 naked, branched towards the top ; stem leaves small, lanceoi 

 late, closely sessile; root leaves petioled, spatulate; heads 

 1-8, terminating the branches of the scape-like stem; rays 

 numerous, white or purplish; involucre hairy j outer row 

 ^ of bristles of the pappus minute. Open prairie, Mau.-Alta. 



Fig. 84,. — 

 Erigeron 

 canadensis. 



