COMPOSITE. >9 



34. RUDBECK'IA, L. CoNE-FLOWEE. 



1. R. lacinia'ta, L. Rays linear, 1-2 inches long, drooping. 



greenish-yellow. Stem tall, smooth, branching. Lowest 

 leaves pinnate, of 5-7 lobed leaflets ; upper ones 3-5- parted, or 

 tlie uppermost undivided and generally ovate. Heads terminal, 

 loug-peduucled. Swamps. 



2. R. hir'ta, L. Rays bright yellow. Disk purplish-broivn. 

 Stem very rough-hairy, naked above, bearing single large head.-'. 

 Leaves 3-ribbed, the lowest spathulate, narrowed into a petiole, 

 the upper ones sessile. Meadows. 



25. HELIAN'THUS, L. SUN-FLOWEB. 



1. H. Strumo'silS, L. Stem 3-4 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. 



2. H. divarica'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, 3-nerved, long- 

 pointed, serrate, rowjh on both sides. Heads few, on short 

 peduncles. Rays about 12. Open thickets and dry plains. 



3. H. decapet'alus, L. Stem 3-6 feet high, branching, smooth 

 below, rough above. Leaves thin, green on both sides, ovate, 

 coarsely serrate, pointed, abruptly contracted into short margined 

 petioles. Rays usually 10. Thickets and river-banks. 



4. H. gigante'llS, L. Stem tall, hairy or rough, branching 

 above. Leaves lanceolate, pointed, serrate, very rough above, 

 haiiy below, narrowed and ciliate at the base. Heads somewhat 

 corymbed, not large. Disk yellow; rays pale yellow, 15-20. 

 Low grounds, western and south-western Ontario. 



5. H. tubero'sus, L., (JERUSALEM ARTICHOKE) has escaped 

 from cultivation in some places. It is at once recognized by its 

 tubers. 



26. BIDEIVS, L. BUB-MARIGOLD. 



1. B. frondo'sa, L. (COMMON BEGGAR-TICKS.) Rays none. 

 Achenes flat, wedge-obovate, ciliate on the margins with bristles 

 pointing upwards, 2-awned, Stem tall, branched, Leaves thin, 



