ORDBR 70. COMPOSITE. 



407 



tonic and febrifugal, as in the chamomilo, colt's-foot, thoroughwort golden rod, etc. Somo are 

 onthelmintics from the prevalence of the resinous principle, as tansey, Artemisia, Vernonia. 

 Others are aromatic and extremely bitter, as wormwood and all the species of Artemisia. Other 

 species are very acrid, as mayweed. The Jerusalem artichoke (Helianthus tuberosus) the vege- 

 table oyster (Tragopogon), the true artichoke (Cynara), lettuce, dandelion and a few others, am 

 the only species useful for food. The order abounds in ornamental plants. 



C41, bis. 1. Helianthus head radiate. 2. Vertical section of the head, showing the scales of the involucre 

 and a single disk-flower remaining upon the convex receptacle. i<. A perfect disk -flower showing every 

 part. 4. Head (radiate) of Solidago. 5. A pistillate, ligulate flower of the ray. 6. A perfect disk fl. 7. A 

 (radiant) head of Taraxacum. 8. A perfect, ligulate fl. 9. Achenium, with its long beak and plnmous 



Eappus. 10. A (radiant) head of Nabalus altissimus. 11. A flower. 12. Lappa major, head discoid. 13. A 

 ower. 1-1. One of the hooked scales. 15. A (discoid) head of Enpatorium purpureum. 16. A flower. 

 17. Ambrosia (Pigweed). IS. Staminate head enlarged. 19. Pistillate involucre enlarged. 20. The fertile 

 flower. 



The following (not conveniently used in Analysis) are De Candolle's 

 SUBORDERS AND TRIBES. 



I. TUBTJLIFLOE^E. Corolla of the perfect fls. tubular, 5-lobed. (A) 



TRIBE 1, VERNONIACEJB. Branches of the style long, slender, terete, and hispid 

 all over. Heads discoid ; flowers all alike perfect Nos. 1 3 



TRIIJK 2, EUPATORIACE.E. Branches of the style clavate, obtuse, flattened, 



minutely pubescent. lids, discoid. Fls. all alike, perfect Nos. 4 15 



TRIBE 3 , ASTEROIDE^:. Branches of the style flat, linear, downy above and 

 opposite the distinct, stigmatic lines, appendaged at top. Heads discoid 

 * or radiate Nos. 1685 



TRIBE 4, SENECIONID<. Branches of the style linear, fringed at the top, truncate 

 or extended into a conical, hispid appendage Nos. 86 87 



TRIBK 5, CYNARE^E. Stylo thickened or node-like at top ; branches not appen- 

 daged, the stigmatic lines not prominent, reaching the apex Nos. S3 97 



II. LIGULI FLORAE. Corollas all lignlate (radiant), the flowers all perfect. (B) 

 TRIBE 6, CICIIORACE.E. Branches of the style long, obtuse, pubescent all over ; 



' stigmatic lines commencing below their middle. Juice milky Nos. 93114 



III. LABIATIFLORJ2. Corolla of the perfect flowers bilabiate. (Q 



TRIBK 7, MITLISIACE.E. Style nearly as in Cynarea), the branches obtuse, very 



convex outside, minutely downy .>t the top .No. 115 



