128 COMMON CANADIAN WILD PLANTS. 



and Gr.) flays yellow or purplish ; disk grayish. Recept- 

 acle oblong. Chaff thickened and bearded at the tip. 

 Pappus none or of 2 teeth. Stem branching from the base, 

 1-2 feet high. Leaves pinnately divided, the divisions 5-9, 

 narrow. Heads single, on the naked branches. N.W. , and 

 at Ottawa. 



37. HELIAN'THUS, L. SUN-FLOWER. 

 * Annuals. Leaves alternate. Receptacle flat. Disk brownish. 



1. H. an'nuus, L. (COMMON SUNFLOWER.) Tall, rough. 

 Leaves 3-ribbed, ovate, serrate. Scales of the involucre 

 long-pointed, ciliate. Escaped from cultivation. 



2. H. petiola'ris, Nutt. More slend*ef, 1-3 feet high. 

 Leaves narrow, mostly entire. Scales seldom ciliate. N. W. 



* * Perennials. Receptacle convex. Lower leaves usually opposite. 

 -- Disk dark. 



3. H. rig'idus, Desf. Stem tall and stout, rough. Leaves 

 very thick and rigid, rough both sides, oblong-lanceolate, 

 pointed at both -ends, the lowest oval, 3-nerved. Rays 

 20-25. Pappus of 2 large, and often several small scales. 



N.W. 



-i- -i- Disk yellow. 



4. H. Nuttall'li, Torr. and Gr. Stem slender, smooth, 

 simple. Leaves lanceolate or linear. Pappus-scales long 

 and narrow. N.W. 



5. H. strumo'SUS, L. Stem 3-6 feet high, smooth below. 

 Leaves broadly lanceolate, rough above and whitish beneath, 

 pointed, serrate with small appressed teeth, short-petioled. 

 Rays about 10. Moist copses and low grounds. 



6. H. divariea'tus, L. Stem 1-4 feet high, smooth, simple 

 or forking above. Leaves all opposite, widely spreading, 

 sessile, rounded or truncate at the base, ovate-lanceolate, 

 o-nerved, long-pointed, serrate, rough on both sides. Heads 

 few, on short peduncles. Rays about 12. Open thickets 

 and dry plains. 



7. H. deeapet'alus, L. Stem 3-6 feet high, branching, 

 smooth below, rough above. Leaves thin, green on both 

 sides, ovate, coarsely serrate, pointed, abruptly contracted 



