128 COMMON CANADIAN WILD PLANTS. 



and Gx.) Bays yellow or purplish ; disk grayish. Eecept- 

 acle oblong. Chaff thickened and hearded 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. SDN-FLOWER. 

 * Annuals. Leaves alternate. Receptacle fiat. Disk brotvmsh. 



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 slender, 1-3 feet high. 

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



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

 I- 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. Eays 



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



N. W. 



-I- -t- Disk yellow. 



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

 simple. Leaves lanceolate or linear. Pappus-scales long 

 and narrow. — N.W. 



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

 Leaves broadly lanceolate, rough above ^.Tidiwliitish beneath, 

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

 Kays about 10. — Moist copses and low grounds. 



6. H. divariea'tUS, L. Stem 1-4 feet high, smoo^/i, simple 

 or forking above. Leaves all opposite, widely spreading, 

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

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

 few, on short peduncles. Eays about 12. — Open thickets 

 and dry plains. 



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

 smooth below, rough above. Leaves t/iin, green on both 

 sides, ovale, coarsely serrate, pointed, abruptly contracted 



